That is a mark of a greater teacher... able to explain the concept in plain and simple terms for the audience to understand. Commendable effort for both narration and the animation. Thank you
00:36 The value 28.01 is for a sample, not a population. There are only 5 data points in total, it is not a sample. Therefore the standard deviation is 25.05, not 28.01.
This is amazing! It takes a real teacher to make something complex seem so simple! Are you considering making a video to explain effect sizes vs. significance?
Thanks for your clear and erudite explanation. I loved watching and listening to this video. I learned a lot. Keep up the excellent work and good luck.
"What is standard deviation" "It's the square root of the variance" Good God, I cannot express how useless that answer has been for me, lol. Thank you for explaining what it actually **is**, OP.
And I'm just as confused as I was before watching this video. You keep using "standard deviation" to explain "standard deviation". But you never really explained WHAT a standard deviation IS. You might as well be explaining that the word "inch" is used to express how many "inches" something is without ever saying WHAT an inch IS. Yes, you said that it is used to determine how far from the mean a given example is. I get your point about how SD is used. But WHAT IS a standard deviation? How is "standard deviation" determined? What makes "1 standard deviation"?
@0:38 here's where my problem lies. You tell what the standard deviation of this particular data set is ($28.01). But you didn't explain how that is determined. So it's just an arbitrary number you pulled out of the air as far as I can tell (given the lack of information). And that's why - even after watching a video entitled "Standard Deviation - Explained and Visualized" - I still have absolutely no clue WHAT an SD IS.
Wood 'n' Stuff The squeaky wheel gets the oil; thank you for being squeaky on behalf of the rest of us dummies who were too shy or too kind to challenge the video :)
It's not just you, he just highlighted what S.D is. E.g it's like we know the quartiles Q1 and Q3 are basically the medians or the lower values and upper values but that still doesn't tell us how to find Q1 and Q3, that's exactly what this dude did.
@ 40 seconds in to it how did you get to the standard deviation of 28.01? Are you teaching this or are you talking to people who already knows this? Sorry but the jumps ahead do not help. I hope you take this input the right way. Thanks.
For anyone doing the maths as they follow the video, I think the standard deviation of 28.01 was calculated using sample standard deviation, not population standard deviation.
I agree. I watched it a few times and I am still trying to understand how we got $28.01. Maybe an actual onscreen written out example would hope. I know it would help me.
Really? "Cause I still have no clue what a standard deviation IS, only that it's used to express how far a given sample deviates from the mean. But what determines HOW FAR from the mean equates to "a standard deviation" or "2 standard deviations", etc...? How is a unit of "standard deviation" defined?
Standard deviation is more like "average distance of the points from the mean". A standard deviation is something you calculate first using the data set in hand, and then go on and see distance from the mean for each point. You can imagine, mean to be the centre of a circle and the standard deviation to be a radius.... this is the average distance of the points from the mean. For a normal distribution, meaning the values are more evenly distributed, 68% of the points fall within that radius. 95% of all the points fall within 2 x radius. 99.7% of the points fall within 3 x radius. You can call the standard deviation as the average deviation (from the mean), if you like. (I think the term average deviation may not be used because the formula for standard deviation uses squares and then square root, which doesn't sound like a real average). See other video from "MrNystrom" regarding standard deviation... that should really help.
I am still thoroughly confused as to how you obtained the SD of $28.01 for the values you used (21,50,62,85,90). I used several online standard deviation calculators and the answer given was $25.05, which is what I calculated. It would be extremely helpful if you would walk us through that rather than using a different value set as an example.
Hi there sorry for the confusion. There are two slightly different ways to calculate standard deviation based on whether you have all the data in the population (SD = $25.05) or are working with a sample of the data (SD = $28.01). I have another video with steps to calculate: ruclips.net/video/WVx3MYd-Q9w/видео.html
Thank you so much for this video. I literally spent a week trying to read and google things but I could not wrap my head around this concept. This helped me sooooo much!
how did you find the standard deviation? please if you're going to try and help people try taking them step by step please it does not help that you give examples with just answers and no steps of how you got to that answer...
Standard deviation = Start with finding sample variance... 1. Sample Variance Take all data points and subtract the mean from each one, square it, and add the sum up ---> (21-61.6)^2 + (50-61.6)^2 + (62-61.6)^2+ (85-61.6)^2 + (90-61.6)^2 = 3137.2 Divide the sum by the amount of data points (5) and subtract 1 ---> 3137.2/ (5-1) = 784.3 2. Standard deviation is the square root of the sample variance ... ---> root 784.3 = 28.005 ~28.01 hope that made sense :)
In school teachers will teach you formula to find things and occasionally draw diagrams Fast Forward: College profs will say you learnt all this things in school in your 8th grade. The main process of understanding remains void.🤥😣
Thanks for the great PowToon! Really great production quality. I'm not an expert on SD, thus I consulted your video. I love seeing experts in their filed find ways to communicate difficult concepts in concise and meaningful ways! Well done! (And adding a transcript - A+)
I watched this video and it explained it so well I’ve had it on repeat on my laptop overnight so when the ads play it watches them all and you get paid more :)
Hi, when I figured out the standard deviation of the money in the wallet scenario I keep coming up with $25.05 (rounded). Can you explain what calc you used to get $28.01 pls?
After searching google for a half hour and dealing with people who couldn’t explain anything to someone who doesn’t know math, this video gave me the straightforward answer I needed. Thank you for actually providing information rather than trying to seem smart by making the explanation more complex than necessary.
to Wood'N" Stuff...I agree totally. I thought I was the only one confused....ugh....but the video definitely made it worse. I wanted him to explain also where he got the standard deviation of $28.01....oh well
Sir really appreciate your explanation of such an elusive topic in an extremely lucid manner. However, the thing is for some weird reason am getting $25.05 as the SD, which is way different from $28.01 that you seem to be getting(as can be seen @0.39). So I don’t understand why my answer doesn’t seem to concur with yours? Do you mind sharing your method of SD calculation, perhaps then I might understand my mistake. Would appreciate your response!
hi, i tried this example and with my own calculations taught to me in your other you tube clip i came up with a standard variation of 25.04 any idea what I'm doing wrong please
There are two formulas for standard deviation. If you have data for the whole population, the formula divides by n. If you only have data for a sample of the population, the formula divides by n-1 as it seems to be a better approximation of the population's standard deviation. In this video, I divide by n-1 because I'm assuming we're talking about a sample. I think the video would probably be more clear if I explained this but oh well.
If you're complaining about the quality of this video in any fashion, then you desperately need a cold cocktail on a mild and sunny day on a tropical beach likely no more than 1.5x standard deviations from where you are right now as you read this silly comment. If you're not complaining about this video, I wish you the same. This video's producer made RUclips just a little bit better by adding it.
You're great. Some students need to see the whole before picking up on the parts. Meaning, computation is great but if students can't understand what is being observed, computation means nothing.
Can anyone explain me how did he found that LeBron is 1 out of 2500, i get that he lies 3 standard deviation above the mean meaning 2.5% but then how 2500 should have been 250 i think so ..
Hi Mr. Jones. I am sorry, but I do not know why I have gone over my calculations and my standard deviation came out to be $25.05. Please explain, thank you.
There are two formulas for standard deviation. If you have data for the whole population, the formula divides by n. If you only have data for a sample of the population, the formula divides by n-1 as it seems to be a better approximation of the population's standard deviation. In this video, I divide by n-1 because I'm assuming we're talking about a sample. I think the video would probably be more clear if I explained this but oh well.
Nice, thought I was doing it wrong. For those following along in the console or terminal: JS: Math.sqrt( ( Math.pow(21 - 61.6, 2) + Math.pow(50 - 61.6, 2) + Math.pow(62-61.6, 2) + Math.pow(85-61.6, 2) + Math.pow(90 - 61.6, 2) ) / (5 - 1) // to take into account the above comment (evaluates to 28.005356630473393) ) Numpy np.std([21, 50, 62, 85, 90]) # 25.048752463945185 Thanks for the video!
You are GREAT! Sometimes we need the information with visual without the math until you understand what it is that is being explained by what standard deviation is.
WHAT MAKES A STANDARD DEVIATION LOW???????????????? LOW COMPARED TO WHAT??? "LOW MEANS IT IS CLUSTERED TOWARD THE MEAN." BUT WHAT DO YOU CONSIDER LOW? SMALLER THAN THE MEAN? LOWER THAN 10? 100,000? IT DOESN'T MAKE SENSE!!!!!!!!!!!!!!!!!
Hey I like the passion!! =) There are no absolute standards for what constitutes a "low" or "small" standard deviation. It will always be relative to some other reference. For example, maybe you're comparing two data sets from two different countries of average age of marriage. Country A has a mean of 27 yrs old with a standard deviation of 2 yrs, and Country B has a mean of 27 yrs old with a standard deviation of 5 yrs. 2 yrs is lower than 5, which means Country A's data is less spread and it's less common to find people getting married at 22 or 32 yrs old than it is in Country B. Hope that helps.
did you seriously just do a four minute video on standard deviation without explaining *either* of "deviation" (what it is, what it looks like) or "standard deviation" (how to aggregate the deviations into a single measure!) .. wtf. 28.51 WHAT. You have such first-class visuals and "production values" (music, nice editing, etc) .. dude make a video about standard deviation. Compare and contrast some actual data sets (NUMBERS). I'll send you money lol
I can only echo every compliment below. You have (apparently!) effortlessly rendered the impenetrable elegantly simple. Genius. Though do still have a question...... Are standard deviations just calculated by measuring in equal chunks of distance in each direction from the centre of the distribution curve? That's what it looks like from the visuals......
2:11 This whole part would have been a lot easier to understand if I understood the imperical measurement system, hahaha. I was like "Okay, so 68% are between 5'7 and 5'13, I get it!", and they were just not. You dear silly Americans with your weird sized feet and numerically illogical measurements.
Hi, at 38 secs I get a standard deviation of $25.05, not $28.01. Am I wrong? I calculated it manually and also used the =STDEV.P formula in excel. Thanks. Also, how did you work out that Lebron James was 1 in 2500 etc. (2 mins 50 secs) Thanks again
Greatly explained, it would be splendid if you go little slower. Just one point, you said 95% of American adults are between Mean +/-6 inches, actually it is 95-68=27% between +/-6 inches and 99.7-95=4.7% between+/- 9 inches. Please correct me as I am always doubtful on my understanding for stats.
I have been using statistics for a long time but never , for some reason, had a chance to question what a standard deviation means (not how it is computed) when you have a binomial distribution. If a Standard deviation is .48 with a mean of .62 . What can I say about mean and standard deviation. I guess it is .62 are a yes in sample taken and 1 standard deviation is .48 which comes out as .14 to 1.1 positives at 1 sigma expected in a new run? Here is a whole number example: if(say 100 tosses) I had a mean of 50 tails and a standard deviation of 5...So a 1 sigma is 50 + - 5 so it follows that 45 to 55 tails can be expected in any new run. Anyone have an answer as to whether or not I am "on track" with my conclusion? I summarize that the standard deviation is actually (in my binomial problem) @UCcEpTk-0rZdm23EC2dHwHEw
How would I solve this problem, anybody?? The amount of milk sold each day by a grocery store is normally distributed with mean 130 gallons and a standard deviation of 12 gallons. On a randomly selected day, what is the probability that the store sells between 140 and 150 gallons of milk?
1:42, some elaboration on what he means by "statistically significant" or "expected variation". We consider some event which is under control can happen if its probability lies within 2 standard deviations on each side i.e., 95% probability in total. However if the event happens and it lies beyond 2 standard deviations i.e., 5% probability in total, we consider this event has happened purely due to chance and it is beyond control. Here in this example if what we are aiming for is,say, the quantity being filled in the bottle is 100ml and we get 95 ml once(which the customer does'nt mind) which falls inside 2 s.d , it is "expected variation". However, if we get a 90ml(which the customer does mind), and we find it lies within our 2 s.d too, the we consider the result statistically significant and try to control it since it not happening purely due to chance. I am assuming that our null hypothesis is "the event will not take place". Correct me if i am wrong : D
I have been using statistics for a long time but never , for some reason, had a chance to question what a standard deviation means (not how it is computed) when you have a binomial distribution. If a Standard deviation is .48 with a mean of .62 . What can I say about mean and standard deviation. I guess it is .62 are a yes in sample taken and 1 standard deviation is .48 which comes out as .14 to 1.1 positives at 1 sigma expected in a new run? Here is a whole number example: if(say 100 tosses) I had a mean of 50 tails and a standard deviation of 5...So a 1 sigma is 50 + - 5 so it follows that 45 to 55 tails can be expected in any new run. Anyone have an answer as to whether or not I am "on track" with my conclusion? I summarize that the standard deviation is actually (in my binomial problem)
Didn't really help me... Why don't you show why the standard deviation was 28,01 for example? that would have explained it. Just saying it is 28,01 doesn't.
Sorry - a follow-up question. I have a sociology paper where respondents can choose yes = 1, or no = 0. The mean = 0.231and SD = 0.421. I have no idea how to conceptualize this binary data in terms of variance of a mean. Please help my brain!
Thank u bro im trying to get in geometry for 8th grade and my stupid book doesnt teach me shit about this. Finally get tk be in a class w my friends cuz of u
i and trying to scetch a normal distribution graph based on a mean of 21.8k and sd of 1k with a range of 19-24k with a nominal value of 22k any advice? i have worked out the numbers but not sure how to explain on a bell graph
Standard deviation does not necessarily have to do with a Normality, it could be used in any data set. Your explanation would only be applicable if your data or sampling distribution had a Normal distribution. You would need to know the shape and center of your data or be able to meet the conditions for a Normal approximation. Your video went beyond the scope of merely describing Standard Deviation and is misleading.
I'm a bit confused about what actually constitutes a high or low SD. How far away from the mean does it have to be to be high and how close to be considered low? Sorry if it's a stupid question and was answered well in the vid, I just struggle with this sort of stuff.
Explained better than the crap I paid for in college
Lol, Same goes here.
College sucks dick lol stealing my money
Reason why I don't plan on going
@@deersteve191 Just an excuse because school is not for you. Hope you won the genetic lottery, otherwise, have fun doing menial jobs.
I thought the same thing lol. Those professors know their stats but terrible at translating it to students.
he sounded so bored out and exhausted during the video up untill "THANK YOU FOR WATCHING!"
Yeah
😂
He ruined it
😂😂😂😂😂
Maybe he made the video as an assignment for his class?? No connection otherwise.
That is a mark of a greater teacher... able to explain the concept in plain and simple terms for the audience to understand. Commendable effort for both narration and the animation. Thank you
Thank you for the transcript, Jeremy, and for taking your time to present this information. Very much appreciated!
00:36 The value 28.01 is for a sample, not a population. There are only 5 data points in total, it is not a sample. Therefore the standard deviation is 25.05, not 28.01.
Right, he mistakenly divided it by n-1 and not by n
Wish I had seen this comment before I spent an hour trying to understand what I had done wrong 😩🙈
@Gordon Gao You're welcome.
8 weeks in tom 3020, stats for business, and this 3:42 vid explained the concept so much more clear and concise
crisp and clear. just what I wanted
This is amazing! It takes a real teacher to make something complex seem so simple! Are you considering making a video to explain effect sizes vs. significance?
Juan Zambonini thanks! My current project is a series of short math puzzles. Thanks for the suggestion!
Sounds cool! CONGRATULATIONS!
Wait how was the standard deviation for the wallet money examples calculated? Completely understand the mean but not how you got $28.01 for STDV
Thanks for your clear and erudite explanation. I loved watching and listening to this video. I learned a lot. Keep up the excellent work and good luck.
Yeq but when you calculate the standard dev then you need to devide the mean by the standard dev to see how much it deviates right ?
"What is standard deviation"
"It's the square root of the variance"
Good God, I cannot express how useless that answer has been for me, lol. Thank you for explaining what it actually **is**, OP.
This ^^^
I guess people who are giving their expert answer on this statistics question are not experts on english lol
And I'm just as confused as I was before watching this video. You keep using "standard deviation" to explain "standard deviation". But you never really explained WHAT a standard deviation IS. You might as well be explaining that the word "inch" is used to express how many "inches" something is without ever saying WHAT an inch IS.
Yes, you said that it is used to determine how far from the mean a given example is. I get your point about how SD is used. But WHAT IS a standard deviation? How is "standard deviation" determined? What makes "1 standard deviation"?
@0:38 here's where my problem lies. You tell what the standard deviation of this particular data set is ($28.01). But you didn't explain how that is determined. So it's just an arbitrary number you pulled out of the air as far as I can tell (given the lack of information). And that's why - even after watching a video entitled "Standard Deviation - Explained and Visualized" - I still have absolutely no clue WHAT an SD IS.
This video's more focused on the concept. This one explains how it's calculated: ruclips.net/video/WVx3MYd-Q9w/видео.html
Jeremy Jones - I appreciate that! I actually find and watched that video after this one. It cleared things up quite nicely. Thank you very much.
Steve , it's the Distance Between Two Standard Points
Wood 'n' Stuff The squeaky wheel gets the oil; thank you for being squeaky on behalf of the rest of us dummies who were too shy or too kind to challenge the video :)
Maybe it just me but I'm still confused!
It's not just you, he just highlighted what S.D is.
E.g
it's like we know the quartiles Q1 and Q3 are basically the medians or the lower values and upper values but that still doesn't tell us how to find Q1 and Q3, that's exactly what this dude did.
@ 40 seconds in to it how did you get to the standard deviation of 28.01? Are you teaching this or are you talking to people who already knows this? Sorry but the jumps ahead do not help. I hope you take this input the right way. Thanks.
For anyone doing the maths as they follow the video, I think the standard deviation of 28.01 was calculated using sample standard deviation, not population standard deviation.
0:37 Might be helpful if instead of just saying what the standard deviation is, you explain how you came to it being the amount $28.01 in this example
exactly
Maybe watch the video first? He literally explains
@@KP-hw5og Maybe unclear from title, lack of referral to other video, lack of mention of series or being in a playlist. Literally? Ok
I agree. I watched it a few times and I am still trying to understand how we got $28.01. Maybe an actual onscreen written out example would hope. I know it would help me.
...just to think after ALL my years of college something so simple was finally made simple.
THANKS
wolfgangk1 Really…? And I’m here at 11pm trying to figure this out for a high school assignment
@@gustavourbina8343same
Why the heck does it say sigma 😅🗿
what the SIGMA?
It stands from Standard deviation
thanks pookie i understood nothing!
NO ONE HAS EXPLAINED THIS BETTER
THANK YOU MUCH!!
I'm in mid-career engineer and I haven't seen such an articulate explanation like this before.
Really? "Cause I still have no clue what a standard deviation IS, only that it's used to express how far a given sample deviates from the mean. But what determines HOW FAR from the mean equates to "a standard deviation" or "2 standard deviations", etc...? How is a unit of "standard deviation" defined?
Standard deviation is more like "average distance of the points from the mean". A standard deviation is something you calculate first using the data set in hand, and then go on and see distance from the mean for each point.
You can imagine, mean to be the centre of a circle and the standard deviation to be a radius.... this is the average distance of the points from the mean. For a normal distribution, meaning the values are more evenly distributed, 68% of the points fall within that radius. 95% of all the points fall within 2 x radius. 99.7% of the points fall within 3 x radius.
You can call the standard deviation as the average deviation (from the mean), if you like. (I think the term average deviation may not be used because the formula for standard deviation uses squares and then square root, which doesn't sound like a real average).
See other video from "MrNystrom" regarding standard deviation... that should really help.
I still have no clue. Did the guy pay you to say that?
luxe1414 bulshit I could barely start to understand one thing before you start talking about something else and had me completely fucked up confused
I am still thoroughly confused as to how you obtained the SD of $28.01 for the values you used (21,50,62,85,90). I used several online standard deviation calculators and the answer given was $25.05, which is what I calculated. It would be extremely helpful if you would walk us through that rather than using a different value set as an example.
Hi there sorry for the confusion. There are two slightly different ways to calculate standard deviation based on whether you have all the data in the population (SD = $25.05) or are working with a sample of the data (SD = $28.01). I have another video with steps to calculate: ruclips.net/video/WVx3MYd-Q9w/видео.html
Thank you so much for this video. I literally spent a week trying to read and google things but I could not wrap my head around this concept. This helped me sooooo much!
how did you find the standard deviation? please if you're going to try and help people try taking them step by step please it does not help that you give examples with just answers and no steps of how you got to that answer...
How did you arrive at a standard deviation of $28.01 after getting a mean of $61.60?
Standard deviation =
Start with finding sample variance...
1. Sample Variance
Take all data points and subtract the mean from each one, square it, and add the sum up
---> (21-61.6)^2 + (50-61.6)^2 + (62-61.6)^2+ (85-61.6)^2 + (90-61.6)^2 = 3137.2
Divide the sum by the amount of data points (5) and subtract 1
---> 3137.2/ (5-1) = 784.3
2. Standard deviation is the square root of the sample variance ...
---> root 784.3 = 28.005
~28.01
hope that made sense :)
that's what I'm wondering ...
@Alexis Anderso
But why we subtract 1 from 5?
Hasan Darwish that is just how the equation goes, subtract 1 from the total # of data points. Not sure of the actual logical reason behind it
@@AlexisAndersonAA basically we do 1/(N-1) when we calculate std of sample of data and for whole population it would be simply 1/N.
In school teachers will teach you formula to find things and occasionally draw diagrams
Fast Forward: College profs will say you learnt all this things in school in your 8th grade.
The main process of understanding remains void.🤥😣
Thanks for the great PowToon! Really great production quality. I'm not an expert on SD, thus I consulted your video. I love seeing experts in their filed find ways to communicate difficult concepts in concise and meaningful ways! Well done! (And adding a transcript - A+)
I get a SD of 25 not 28...
Fantastic! Clearly explained, graphics are germane and interesting. Concise. Thanks!
leave the germans out of this
You could've explained how to calculate the standard deviation at the beggining of the video
this video is to explained WHAT is standard deviation, not to calculate them
Really simple, concise and the analogies used in place of a definition makes it even easier to grasp. Apreciate it
I watched this video and it explained it so well I’ve had it on repeat on my laptop overnight so when the ads play it watches them all and you get paid more :)
Love what you did here sir
❤❤❤
How to calculate that Lebron is 1 in 2500 ? Thanks.
Heard the music in the intro and thought I clicked on a food wishes video
lol me too
Same
Hello can you please elaborate the relation of the $28.91 std deviation to the set of data.
this
skibidi bop bop bop yes yes skibidi bop bop yes yess SIGMA THERE IS SIGMA MALE IN MATH?😱😱
Oh my god this was so perfectly explained, so concise, wow what a perfect video
Hi, when I figured out the standard deviation of the money in the wallet scenario I keep coming up with $25.05 (rounded). Can you explain what calc you used to get $28.01 pls?
Look at comments below, you need to -1 from the number of data points before the last square root. You then get 28.005 which you round up to 28.01.
After searching google for a half hour and dealing with people who couldn’t explain anything to someone who doesn’t know math, this video gave me the straightforward answer I needed.
Thank you for actually providing information rather than trying to seem smart by making the explanation more complex than necessary.
Seriously incredible teaching style you have here. Thank you so much for this information.
thank you for explaining this. you made it simple and to the point with no extra fluff to confuse those who are learning. great job.
I thought Mr. Plinkett, Mike and Jay were about to show up when I started this. I clapped, I clapped when I heard it! Things I knoooowww
IT BROKE NEW GROUND
This video is in found within the 5th standard deviation of good videos.
Hello this is chef John from food wishes dot com wiiiiiiith.... oops wrong channel
to Wood'N" Stuff...I agree totally. I thought I was the only one confused....ugh....but the video definitely made it worse. I wanted him to explain also where he got the standard deviation of $28.01....oh well
Well explained using a clean and simple presentation and in layman's terms. Well done sir!
Hello! And welcome to foodwishes.com, with...
+Jimmy Watson hahahha I recognized the music right away :D
i have seen a lot of videos lately to understand the concept but you really are the only one who make me understand. thanks
Sir really appreciate your explanation of such an elusive topic in an extremely lucid manner. However, the thing is for some weird reason am getting $25.05 as the SD, which is way different from $28.01 that you seem to be getting(as can be seen @0.39). So I don’t understand why my answer doesn’t seem to concur with yours? Do you mind sharing your method of SD calculation, perhaps then I might understand my mistake. Would appreciate your response!
Can someone please explain how 0.15% is taller than 6'7"? 2:40
@@mutahartechtips9444 thank you so much for replying anyway! Have a blessed day
hi, i tried this example and with my own calculations taught to me in your other you tube clip i came up with a standard variation of 25.04
any idea what I'm doing wrong please
There are two formulas for standard deviation. If you have data for the whole population, the formula divides by n. If you only have data for a sample of the population, the formula divides by n-1 as it seems to be a better approximation of the population's standard deviation. In this video, I divide by n-1 because I'm assuming we're talking about a sample. I think the video would probably be more clear if I explained this but oh well.
The standard deviation for the set of numbers presented at 0:39 is $25.05 not $28.01. Besides that, a very good explanation!
This difference comes from different formulas of variance: some divide by N others by N-1.
Thank you a very helpful video
please help understand how you found the value for lebron being 1 in 2500 and Yao ming 1 in 450 mil!
If you're complaining about the quality of this video in any fashion, then you desperately need a cold cocktail on a mild and sunny day on a tropical beach likely no more than 1.5x standard deviations from where you are right now as you read this silly comment. If you're not complaining about this video, I wish you the same. This video's producer made RUclips just a little bit better by adding it.
Drew Arnold Hahaha amazing! Thanks for this! Glad you liked the video.
please help understand how you found the value for lebron being 1 in 2500 and Yao ming 1 in 450 mil!
I love your explanation, delivery style and your voice. Currently learning complicated spreadsheets in Excel 2016 brought me here! Again, tyvm!
You're great. Some students need to see the whole before picking up on the parts. Meaning, computation is great but if students can't understand what is being observed, computation means nothing.
dog
could not get it in a whole semester, got it in 5 minutes
Can anyone explain me how did he found that LeBron is 1 out of 2500, i get that he lies 3 standard deviation above the mean meaning 2.5% but then how 2500 should have been 250 i think so ..
How did you even get that close?
thanks for this. lots of college students in here. our education system is not very evolved lol
WHY IS THIS VIDEO SO GOOD???
I was a bit of a math nerd in HS but never understood what this was until today when I saw this freaking video wow
Hi Mr. Jones. I am sorry, but I do not know why I have gone over my calculations and my standard deviation came out to be $25.05. Please explain, thank you.
There are two formulas for standard deviation. If you have data for the whole population, the formula divides by n. If you only have data for a sample of the population, the formula divides by n-1 as it seems to be a better approximation of the population's standard deviation. In this video, I divide by n-1 because I'm assuming we're talking about a sample. I think the video would probably be more clear if I explained this but oh well.
Nice, thought I was doing it wrong. For those following along in the console or terminal:
JS:
Math.sqrt(
(
Math.pow(21 - 61.6, 2) +
Math.pow(50 - 61.6, 2) +
Math.pow(62-61.6, 2) +
Math.pow(85-61.6, 2) +
Math.pow(90 - 61.6, 2)
)
/ (5 - 1) // to take into account the above comment (evaluates to 28.005356630473393)
)
Numpy
np.std([21, 50, 62, 85, 90]) # 25.048752463945185
Thanks for the video!
Best explanation of standard deviation I've come across yet, thanks for this!
with this video, the memories of my college stats subjects which i've taken around 2 decades ago suddenly got refreshed. Thank you
Great explanation, the visuals were clutch!
You are GREAT! Sometimes we need the information with visual without the math until you understand what it is that is being explained by what standard deviation is.
“Did he not read the syllabus? Professor writes his own tests with 50 something deviations?”
Food wishes?
+Bruce Wayne I should have scrolled down a little, just made the same observation! :P
sigma balls
This comment appeared at the last few seconds of this video and I laughed out loud.
@@robertito_dobbsW algorithm
Chef John from foodwishes.com
Can you please explain how to come up with a conclusion that Yao Ming is 1 / 450,000,000 ? Thank you in advance.
May be a good idea to have a video that explains Mean, Median and Mode before jumping into Standard Deviation. Great work. Thank you.
great video, saved me from the scary dave. thankyou so much.
Thank you Brother
WHAT MAKES A STANDARD DEVIATION LOW????????????????
LOW COMPARED TO WHAT???
"LOW MEANS IT IS CLUSTERED TOWARD THE MEAN." BUT WHAT DO YOU CONSIDER LOW? SMALLER THAN THE MEAN? LOWER THAN 10? 100,000? IT DOESN'T MAKE SENSE!!!!!!!!!!!!!!!!!
Hey I like the passion!! =) There are no absolute standards for what constitutes a "low" or "small" standard deviation. It will always be relative to some other reference. For example, maybe you're comparing two data sets from two different countries of average age of marriage. Country A has a mean of 27 yrs old with a standard deviation of 2 yrs, and Country B has a mean of 27 yrs old with a standard deviation of 5 yrs. 2 yrs is lower than 5, which means Country A's data is less spread and it's less common to find people getting married at 22 or 32 yrs old than it is in Country B. Hope that helps.
This is the one!! Omg I hate this stuff, but this was so easy to understand. Thank you!
did you seriously just do a four minute video on standard deviation without explaining *either* of "deviation" (what it is, what it looks like) or "standard deviation" (how to aggregate the deviations into a single measure!) .. wtf. 28.51 WHAT. You have such first-class visuals and "production values" (music, nice editing, etc) .. dude make a video about standard deviation. Compare and contrast some actual data sets (NUMBERS). I'll send you money lol
I can only echo every compliment below. You have (apparently!) effortlessly rendered the impenetrable elegantly simple. Genius. Though do still have a question...... Are standard deviations just calculated by measuring in equal chunks of distance in each direction from the centre of the distribution curve? That's what it looks like from the visuals......
2:11 This whole part would have been a lot easier to understand if I understood the imperical measurement system, hahaha.
I was like "Okay, so 68% are between 5'7 and 5'13, I get it!", and they were just not.
You dear silly Americans with your weird sized feet and numerically illogical measurements.
2:22 "5'10 with a standard deviation of 3 inches" How did you calculate the 3 inches part? How do you know that number? I just want to understand :)
Hi, at 38 secs I get a standard deviation of $25.05, not $28.01. Am I wrong? I calculated it manually and also used the =STDEV.P formula in excel. Thanks.
Also, how did you work out that Lebron James was 1 in 2500 etc. (2 mins 50 secs) Thanks again
Greatly explained, it would be splendid if you go little slower. Just one point, you said 95% of American adults are between Mean +/-6 inches, actually it is 95-68=27% between +/-6 inches and 99.7-95=4.7% between+/- 9 inches. Please correct me as I am always doubtful on my understanding for stats.
I have been using statistics for a long time but never , for some reason, had a chance to question what a standard deviation means (not how it is computed) when you have a binomial distribution. If a Standard deviation is .48 with a mean of .62 . What can I say about mean and standard deviation. I guess it is .62 are a yes in sample taken and 1 standard deviation is .48 which comes out as .14 to 1.1 positives at 1 sigma expected in a new run?
Here is a whole number example: if(say 100 tosses) I had a mean of 50 tails and a standard deviation of 5...So a 1 sigma is 50 + - 5 so it follows that 45 to 55 tails can be expected in any new run. Anyone have an answer as to whether or not I am "on track" with my conclusion? I summarize that the standard deviation is actually (in my binomial problem)
@UCcEpTk-0rZdm23EC2dHwHEw
How would I solve this problem, anybody??
The amount of milk sold each day by a grocery store is normally distributed with mean 130
gallons and a standard deviation of 12 gallons.
On a randomly selected day, what is the probability that the store sells between 140 and 150 gallons of milk?
1:42, some elaboration on what he means by "statistically significant" or "expected variation". We consider some event which is under control can happen if its probability lies within 2 standard deviations on each side i.e., 95% probability in total. However if the event happens and it lies beyond 2 standard deviations i.e., 5% probability in total, we consider this event has happened purely due to chance and it is beyond control. Here in this example if what we are aiming for is,say, the quantity being filled in the bottle is 100ml and we get 95 ml once(which the customer does'nt mind) which falls inside 2 s.d , it is "expected variation". However, if we get a 90ml(which the customer does mind), and we find it lies within our 2 s.d too, the we consider the result statistically significant and try to control it since it not happening purely due to chance.
I am assuming that our null hypothesis is "the event will not take place".
Correct me if i am wrong : D
I have been using statistics for a long time but never , for some reason, had a chance to question what a standard deviation means (not how it is computed) when you have a binomial distribution. If a Standard deviation is .48 with a mean of .62 . What can I say about mean and standard deviation. I guess it is .62 are a yes in sample taken and 1 standard deviation is .48 which comes out as .14 to 1.1 positives at 1 sigma expected in a new run?
Here is a whole number example: if(say 100 tosses) I had a mean of 50 tails and a standard deviation of 5...So a 1 sigma is 50 + - 5 so it follows that 45 to 55 tails can be expected in any new run. Anyone have an answer as to whether or not I am "on track" with my conclusion? I summarize that the standard deviation is actually (in my binomial problem)
Didn't really help me... Why don't you show why the standard deviation was 28,01 for example? that would have explained it. Just saying it is 28,01 doesn't.
Sorry - a follow-up question. I have a sociology paper where respondents can choose yes = 1, or no = 0. The mean = 0.231and SD = 0.421. I have no idea how to conceptualize this binary data in terms of variance of a mean. Please help my brain!
Thank u bro im trying to get in geometry for 8th grade and my stupid book doesnt teach me shit about this. Finally get tk be in a class w my friends cuz of u
ah yes, u sound like casually explained. absolute banger
He said "This reasoning suggests that Lebron James is 1 in 2500 and Yao Ming is 1 in 450 million"
how did he find that out, please explain.
i and trying to scetch a normal distribution graph based on a mean of 21.8k and sd of 1k with a range of 19-24k with a nominal value of 22k any advice? i have worked out the numbers but not sure how to explain on a bell graph
oh this is 8 years ago...its 5'9..the average is 5'9 as of 2024 now. Only 14% are 6 ft or taller and same for men 5'6 and shorter.
Showed this to my class, the class average after was 47%. Bad video? Bad class? Healthy mix. Thank you so much!
hhmmss: regular ordinary baseline average mean bell curve variance fluctuation range statistic standard deviation population
Hello this is Chef John from FoodWishes withhhhh..... Standard Deviation!
Standard deviation does not necessarily have to do with a Normality, it could be used in any data set. Your explanation would only be applicable if your data or sampling distribution had a Normal distribution. You would need to know the shape and center of your data or be able to meet the conditions for a Normal approximation. Your video went beyond the scope of merely describing Standard Deviation and is misleading.
you made it way easier to understand !! Impressive work Sir.
I'm a bit confused about what actually constitutes a high or low SD. How far away from the mean does it have to be to be high and how close to be considered low? Sorry if it's a stupid question and was answered well in the vid, I just struggle with this sort of stuff.