thanks for taking the time to put this together - guys like you make the world a better place by freely making education available to the masses for free - you rule!
Oisin Hughes Thank you very much. My form teacher are perfectly in knowledge however he doesn't know how to teach ,under his teaching the students cannot really understanding what is real normal distribution and only on remember the fix formula. If you remember the formula you get the score If you don't,you can't pass the exam. That was why most of the our class had failed this subject years ago.NOT on understand but on memory
After hours of laboring, and countless youtube videos, I finally got one that broke it down in bits and pieces. For one who is coming from a not too sound mathematical background, this video has been a life saver in understanding normal distributions. I'll now go ahead and tackle probability with this new found knowledge. Muchos gracias!!!
For those of you who have different charts, you're suppose to subtract the z-scores from one another instead of adding them like he does. For example, with the second problem: If you look at your chart and get .02275 for -2.00, and .97725 for 2.00; SUBTRACT them. When you subtract .02278 - .97725, you get 95.45. It isn't 95.44 but its close enough... I did the same thing with the first problem. I got z-scores .15866 for -1.00 and .84134 for 1.00. When I properly subtracted them, I got 68.26.
so much clearer and easier to understand than coming from an old PhD professor....and the book. needless to say what i spent hours trying to comprehend I easily learned by watching this video twice. No bs. straight to the point. How teaching should be.
Thank you so much for keeping this video concise, simply and straightforward. The hours I have invested in this week only, by being at Uni have tested my sanity in regards to normal distribution. It is now getting synthesise in my being slowly but surely. My lecturer, oddly enough commented on how many tabs I had on my laptop when helping me with something , little does she know I have spent about an hour and a half just searching through videos on this subject….I wish I had found this earlier . It just shows you the algorithm is truly watching your moves…. Just think about that for a moment. Thanks again for your generosity.
Seven years later, a random Turk from the Netherlands comes by, learns what the system didn't want to provide, or assumed we already knew, and leaves again. Thank you for putting this here. Out of all the videos out there, only yours helped me out.
Thank you! This makes so much sense. My book made is seem like greek! Please post all of your teachings! Teachers like you make the world a better place.
I have my first math exam in two years tmrw and doing the textbook problems had me so stumped. I'm solving these with you and pausing so I can test myself and beat you to the next step. I'm nailing all these and feeling way more confident about not only solving the problems but also about the logic behind it all. Thanks so much for this great video :)
Just wanted to say thank you! I'm in beginners Stats class and could not figure a certain problem out...random person scoring above 65%. Your instruction on IQ of greater than 130% helped me out! Thanks again!!
+Moonfall Hey as someone who has written a final on this, can you please explain the last example? He spoke about a standard rule and 3 standard deviations...what is that all about?
Americans are the most Generous People on the planet top education for free. I never meet people like you here in Germany I love America. clear and very helpful
Excellent work. The only confusion might arise from calling the table data that you look up “distances” when they are actually the AREA under the curve. You do say area in the example where you have to subtract it from 0.5 to determine the “greater than” AREA. For those of you with the double data values, you4 chart is giving the area between the -x and +x value of the z score.. so it’s double the area.
My poor head don't understand the concept yet , but after strolling dozens of videos , your video game high hopes , thank you , i like the steps you go through, my professor is like a hurricane !!
THANK YOU SO MUCH. I have a college class certification due in 4 days and this really helped me understand bell curves and standard deviation with percentages. You rock!
My instructor is incredibly bad. He rambles, starts and stops at odd points, and generally makes no sense. He does a poor job of relating the information he's spewing out to what it actually represents, and to top it all off, he wrote his own text for the class which makes just as much sense. I had no idea how to do my homework. Class has been in session for almost a month. By 7:47 in this video, you've already managed to teach me more than he has thus far this semester. I can't thank you enough for posting this.
you explain it very concisely and it's straight to the point. It's helped me tremendously. Thank you. I think, learning the symbols that correspond to this language are the hardest part when understanding this concept. Also, it's essential to understand the formula when solving these problems. My Professor didn't explain it so I understood it or didn't take the time. Your online video shows all this in an easy to understand format. Keep up the good work in helping people work through challenging concepts in an easy manner.
you explained what my professor (who has a phd and whos been published dozens of times) could not. Sir, I tip my hat to you, and id like to buy you a beer (if your ever in the area). Many thanks.
This topic can be really difficult the first time learning them, but once it clicks (Which can take a while), it's not so bad. You seem to help it click a lot more quickly than it otherwise would!
The percentage of dislikes to likes for this video at this moment is 234 out of 5.7K or 4.1% lying outside 2 standard deviations or 100 - 2 x 47.72 = 4.56% ! Meaning the dislikers are insignificant critics to this well-made video. Thanks pspollard1 !
Thank you! You made it simple to understand. The CFA study guide made used 900 variables and made it so impossible to understand. Could have explained what the z score and z table mean in one sentence.
@danpluso you're right! Another way I look at it now is instead of adding .3413 and .3413 we substract it! So because I use the "normal" table from my textbook, or "area from the left" table. The figures would be 0.8413 - 0.1587 and voila 68.26%. Thank you danpluso.
life saver thank you for this video because my teacher in statistics get mad on us then he told that he is going to have a quiz but he didnt discuss this very well
supirior thinker, 1. plz correct your spelling first, .....2. when u feel urself superior and start to boast, u actually lose ur ability to learn more...there are still millions ideas to learn....and 3. ur bragging looks like u really learnt about "black-hole" at 15 becoz by then u started reaching adolescence...4. I learnt by heart an epic book >2000 pages "mahabharata" by 10, calculus by 8, steriochemistry by 12, Molecular medicine by 15, and completed my phd in 23.... !!! and still i am learning basic statistics becoz, i missed learning it since long !!! so fuck u !!
you are the first person I unstand. prof always keeps in algebraic form but idk what it stands for when u break it u take a hard problem make it simple
@rockentui You may be getting confused by the two different chart versions like I myself was a few days ago. It seems like the most common chart used in classes is the "Area from the left" chart while this video is using the "Area from the mean" chart. Add a .5 to the last value on his chart (Z=3.9) and you will get the .9990 that is on the "Area to the left" chart.
It's because the area for the z in your table starts from -3.5 to 3.5. Not from 0 to 3.5. For your case, just subtract .5000 of the given cumulative area. Sorry for posting this 4 years after your comment.
2:19 I might be wrong, but I think the entry in the table represents the area under the curve (the percentage of the total 1 under the curve ) if Z-score=1 rather than the "Z-score". Consequently, in the following graph, 0.3414 should not be present as a distance, but an area.
Hello I am really struggling with an assignment question, your video helped me a lot but I am still not getting anywhere close to the multiple choice answers for my assignment please help if you can. The books I have are gibberish and your video was the first that actually made any sense For a random variable that is normally distributed, with a population mean = 80 and a population standard deviation =10, the probability that a simple random sample of 25 items will have a mean that is between 79 and 85 is 1. 0:9938 2. 0:3085 3. 0:6853 4. 0:4997 5. 0:6835
Hello ! I've just watched many videos about standard deviation and couldn't understand what exactly it was. But after watching your video, within three minutes, i totally understand what the standard deviation really is. Your video really worked for me to understand it, Thanks !
great video, but shouldn't the z-scores be different considering one is positive and the other is negative? on the sheet i have the z-score for -2 is .0228 while the z-score for 2 is .9772. If you could clarify this issue up it'd mean a lot! thanks
R Mansour He is using a z- table of half the graph or .5 of the bell curve. If you have a table showing the full graph you would subtract from 1 not 0.5... i.e. for the last example 1-.9987 = .0013 . Your table is prob showing pvalues for all area to the left of your x. For the example you have you would take .9772 (all area to the left of 130) then you would have to subtract all area to the left of 70, which is (z score of -2) .0228 =.9544 ..... Hope that helps, I had the same issue, then realized he has a different table, for ours you have to use the pos and neg z tables.
thank you very much for your clear teaching. I will be indeed grateful if you consider my problem .let's consider the function be defined such as g(x,v) where v~N(mu = 150 , sigma=15) how can we find the P(100 - x*v)>0 ?? ... in an article author states the probability 4.29*10^-4
![Lil Uzi Vert - Chill Bae [Official Music Video]](http://i.ytimg.com/vi/D7F42F_JM3U/mqdefault.jpg)
thanks for taking the time to put this together - guys like you make the world a better place by freely making education available to the masses for free - you rule!
overpriced academia be like "THEY TOOK OUR JOBS!"
Oisin Hughes stay blessed
Oisin Hughes
Thank you very much.
My form teacher are perfectly in knowledge however he doesn't know how to teach ,under his teaching the students cannot really understanding what is real normal distribution and only on remember the fix formula.
If you remember the formula you get the score
If you don't,you can't pass the exam.
That was why most of the our class had failed this subject years ago.NOT on understand but on memory
Oisin Hughes this had shows the difference way on the teaching.
Instead of memory teaching.make students understand are more helpful.Thanks you again
ruclips.net/video/029laWCUOj4/видео.html
I love how you did it multiple times. Its 1 million times better than other vids when they just show you once. This really gets it through your head.
your head! It like most degrees are apparent to me before doing them!
whos here for tomorrow's exam
lol me
me grade 9 student huhuhu
ME ME
hahahahah me
SAMEEEEE
this is honestly what I look for in a online math video , no rambling... you nailed it.
After hours of laboring, and countless youtube videos, I finally got one that broke it down in bits and pieces. For one who is coming from a not too sound mathematical background, this video has been a life saver in understanding normal distributions.
I'll now go ahead and tackle probability with this new found knowledge.
Muchos gracias!!!
Way easier to understand than my stats prof
+GoldenArrow AGREED
Straight forward, simple, no unneeded explanations. Just what I was looking for. Thank You
For those of you who have different charts, you're suppose to subtract the z-scores from one another instead of adding them like he does. For example, with the second problem: If you look at your chart and get .02275 for -2.00, and .97725 for 2.00; SUBTRACT them. When you subtract .02278 - .97725, you get 95.45. It isn't 95.44 but its close enough...
I did the same thing with the first problem. I got z-scores .15866 for -1.00 and .84134 for 1.00. When I properly subtracted them, I got 68.26.
Thank you so VERY much for this comment! I was going crazy trying to figure out why I couldn't get the same answer!!
so much clearer and easier to understand than coming from an old PhD professor....and the book. needless to say what i spent hours trying to comprehend I easily learned by watching this video twice. No bs. straight to the point. How teaching should be.
Thank you so much for keeping this video concise, simply and straightforward. The hours I have invested in this week only, by being at Uni have tested my sanity in regards to normal distribution. It is now getting synthesise in my being slowly but surely. My lecturer, oddly enough commented on how many tabs I had on my laptop when helping me with something , little does she know I have spent about an hour and a half just searching through videos on this subject….I wish I had found this earlier . It just shows you the algorithm is truly watching your moves…. Just think about that for a moment. Thanks again for your generosity.
My teacher was explaining this to the class for around 2 classes and most of us didnt get it. This video is the best!
Seven years later, a random Turk from the Netherlands comes by, learns what the system didn't want to provide, or assumed we already knew, and leaves again. Thank you for putting this here. Out of all the videos out there, only yours helped me out.
Thank you! This makes so much sense. My book made is seem like greek! Please post all of your teachings! Teachers like you make the world a better place.
I was in a 3 hour lecture at uni not being able to understand it at all and you explained it in 10 minutes.... impressive ! Thank you so much.
I have my first math exam in two years tmrw and doing the textbook problems had me so stumped. I'm solving these with you and pausing so I can test myself and beat you to the next step. I'm nailing all these and feeling way more confident about not only solving the problems but also about the logic behind it all. Thanks so much for this great video :)
clear as hell, i was doing CFA level 1 test and struggling with normal distribution! your lecture is amazing.. it helps a lot, thx buddy
Just wanted to say thank you! I'm in beginners Stats class and could not figure a certain problem out...random person scoring above 65%. Your instruction on IQ of greater than 130% helped me out! Thanks again!!
You're a life saver! Been studying for final and was having issues until watching your video. THANK YOU.
This is a miracle. I didn't get this until I watched your video and my final is tomorrow morning. XD thanks for sharing!
how did your final go?
+Moonfall Hey as someone who has written a final on this, can you please explain the last example? He spoke about a standard rule and 3 standard deviations...what is that all about?
I'm in the exact same position, 6 years later XD
This professor is so awesome that Majority of people can understand Z score calculations within 10 minutes :)
Thanks for not talking too much and making it sound so easy/simple!!!
finals in about 2 hours and you made more sense in 10 mins than my lecturer in 3 months - thank youuu
LOVE how simple and to the point, you make this!
Americans are the most Generous People on the planet top education for free.
I never meet people like you here in Germany
I love America.
clear and very helpful
Yes, our education system is awesome because we give financial aid to people that can't afford school :) Most of us are generous with knowledge too.
supirior thinker how are u so rude to ppl when youtube name is spelled wrong? humble yourself and stop with the negativity
you are genius...at least for for me .. you are between those very tiny percentage of people who can explain this in such a easy way ... God Bless
you made this so easy to understand in 10 minutes when my teacher spent 1 hour trying to figure out how she did it the first time... Thank you so much
Is it too much to ask for additional examples? This was BEYOND GREAT and something I haven't seen that goes straight to the point!
thanks so much. learn more in this ten minutes than class for the last two weeks
The most easy and useful in all RUclips videos of normal distribution thank for easy explanation ready for exams now
Excellent work. The only confusion might arise from calling the table data that you look up “distances” when they are actually the AREA under the curve. You do say area in the example where you have to subtract it from 0.5 to determine the “greater than” AREA. For those of you with the double data values, you4 chart is giving the area between the -x and +x value of the z score.. so it’s double the area.
You are right. It is formally called "area under normal curve"
My poor head don't understand the concept yet , but after strolling dozens of videos , your video game high hopes , thank you , i like the steps you go through, my professor is like a hurricane !!
THANK YOU SO MUCH. I have a college class certification due in 4 days and this really helped me understand bell curves and standard deviation with percentages. You rock!
My instructor is incredibly bad. He rambles, starts and stops at odd points, and generally makes no sense. He does a poor job of relating the information he's spewing out to what it actually represents, and to top it all off, he wrote his own text for the class which makes just as much sense. I had no idea how to do my homework. Class has been in session for almost a month.
By 7:47 in this video, you've already managed to teach me more than he has thus far this semester. I can't thank you enough for posting this.
first person out of 10 I've seen to not fuck up the bell curve by allowing to touch the x-axis. good job
you explain it very concisely and it's straight to the point. It's helped me tremendously. Thank you. I think, learning the symbols that correspond to this language are the hardest part when understanding this concept. Also, it's essential to understand the formula when solving these problems. My Professor didn't explain it so I understood it or didn't take the time. Your online video shows all this in an easy to understand format. Keep up the good work in helping people work through challenging concepts in an easy manner.
This has to be 1 of the best video out there on Zscore...thanks
you explained what my professor (who has a phd and whos been published dozens of times) could not. Sir, I tip my hat to you, and id like to buy you a beer (if your ever in the area). Many thanks.
This topic can be really difficult the first time learning them, but once it clicks (Which can take a while), it's not so bad. You seem to help it click a lot more quickly than it otherwise would!
Thank you so much! My final exam is in 30 mins and you’ve made this really clear for me!
This was amazing. I finally get z scores. I love the fact that you went step by step and gave several examples. Nicely done
The percentage of dislikes to likes for this video at this moment is 234 out of 5.7K or 4.1% lying outside 2 standard deviations or 100 - 2 x 47.72 = 4.56% ! Meaning the dislikers are insignificant critics to this well-made video. Thanks pspollard1 !
Excellent. This example can be replicated in any set of scores - including employee performance , Ranking of companies in revenue performance, etc.
Thank you! You made it simple to understand. The CFA study guide made used 900 variables and made it so impossible to understand. Could have explained what the z score and z table mean in one sentence.
This has just saved me from failing stats due to having a terrible professor! Thank you so much for the video!
I have an exam in 1 day and you literally saved me.
my life was missing this information. Good work!!!
@danpluso you're right! Another way I look at it now is instead of adding .3413 and .3413 we substract it! So because I use the "normal" table from my textbook, or "area from the left" table. The figures would be 0.8413 - 0.1587 and voila 68.26%. Thank you danpluso.
i have an exam after 3 hours about this .. i am very thankful for u
have a test tomorrow and this video just saved my life
thank you, this helped so much. i can not explain how glad i am i found this video
Good explanation.
Please answer my question that is it necessary to convert raw data in z scores to check your normality?
life saver thank you for this video because my teacher in statistics get mad on us then he told that he is going to have a quiz but he didnt discuss this very well
The effort of having examples helps a lot
I like this explanation. It's simplified and dummy-friendly.
supirior thinker, 1. plz correct your spelling first, .....2. when u feel urself superior and start to boast, u actually lose ur ability to learn more...there are still millions ideas to learn....and 3. ur bragging looks like u really learnt about "black-hole" at 15 becoz by then u started reaching adolescence...4. I learnt by heart an epic book >2000 pages "mahabharata" by 10, calculus by 8, steriochemistry by 12, Molecular medicine by 15, and completed my phd in 23.... !!! and still i am learning basic statistics becoz, i missed learning it since long !!! so fuck u !!
you are the first person I unstand. prof always keeps in algebraic form but idk what it stands for when u break it u take a hard problem make it simple
Thank you so much for the most simplest breakdown ever!!!!!! I wish you taught at a college near by my residence. Thank you
@rockentui You may be getting confused by the two different chart versions like I myself was a few days ago. It seems like the most common chart used in classes is the "Area from the left" chart while this video is using the "Area from the mean" chart. Add a .5 to the last value on his chart (Z=3.9) and you will get the .9990 that is on the "Area to the left" chart.
Best video for Normal Distribution & Z-scores.. -Thank you for this!!!
i finally understand how to apply the information from class. thank you so much
te iban a raspar con esa materia.
Ivan Burgos iban... jejeje ahora no
Dios te bendiga muñeco
I now feel that I may actually pass this unit. Thank you so much for taking the time to make this video.
omg hes saved my life! i was freaking out about my exam coming up
I know this video was uploaded literally 8 years ago, but now it all makes sense and I’m going to pass my standard
How come the Z table I was given in class is different ? at 1.00 on my Z tableI have .8413
i got that allso that value but i did i the sci cal...not actually on z table
It's because the area for the z in your table starts from -3.5 to 3.5. Not from 0 to 3.5.
For your case, just subtract .5000 of the given cumulative area.
Sorry for posting this 4 years after your comment.
same
AJ Radaza lmaoooo 🤣🤣🤣🤣🤣
@@AJRadaza no thanks for posting this.I am having problems and this was helpful...but mine starts from _3.0
Finally! an explanation that makes sense!. thank you so much! i've spent hours trying to figure this out and you did it in 10 minutes.
2:19 I might be wrong, but I think the entry in the table represents the area under the curve (the percentage of the total 1 under the curve ) if Z-score=1 rather than the "Z-score". Consequently, in the following graph, 0.3414 should not be present as a distance, but an area.
Thank you sir! I was trying to learn this from the text for the last hour.. you made it so much easier!!
You are a life savior Sir
Hello I am really struggling with an assignment question, your video helped me a lot but I am still not getting anywhere close to the multiple choice answers for my assignment please help if you can. The books I have are gibberish and your video was the first that actually made any sense
For a random variable that is normally distributed, with a population mean = 80 and a population standard deviation =10, the probability that a simple random sample of 25 items will have a mean that is between 79 and 85 is
1. 0:9938
2. 0:3085
3. 0:6853
4. 0:4997
5. 0:6835
thank you bro! i need this tomorrow for my exams
I can't believe it's that simple!!
Thank you so much for making my life easier
That was explained perfectly! what tool did you use to create this?
I'm currently using powerpoints
Thank you so much :) I realized I should thank each video that teach well. You are one of them, Mister! Keep going :)
This guy is so good and I'm learning this stuff in my sophomore year
Of high school
Very good explanation but in 7.29 how did he know that St.Dev 15 is .5000? Please explain to me if someone knows, thanks in advance!
You teach this soo much better than my teacher. She made it far to complicated and didn't explain it aswell as you did
When my teacher introduced this topic I got overwhelmed by the name, goos thing she linked your video to the classroom.
This helped refreshed my memory! Have a final tomorrow
Hello ! I've just watched many videos about standard deviation and couldn't understand what exactly it was. But after watching your video, within three minutes, i totally understand what the standard deviation really is. Your video really worked for me to understand it, Thanks !
This video is absolute genius! Thanks so much, you made it just so easy to understand
Hello Sir, probability between the two numbers would be the substraction of smaller area from the larger area to give the area between them
Thank you so much. Failed statistics. Must now help my daughter. I now understand z scores. You might just help her pass!
Thank you sooooo much! This makes a lot more sense than it did in class.
great video, but shouldn't the z-scores be different considering one is positive and the other is negative? on the sheet i have the z-score for -2 is .0228 while the z-score for 2 is .9772. If you could clarify this issue up it'd mean a lot! thanks
R Mansour He is using a z- table of half the graph or .5 of the bell curve. If you have a table showing the full graph you would subtract from 1 not 0.5... i.e. for the last example 1-.9987 = .0013 . Your table is prob showing pvalues for all area to the left of your x. For the example you have you would take .9772 (all area to the left of 130) then you would have to subtract all area to the left of 70, which is (z score of -2) .0228 =.9544 ..... Hope that helps, I had the same issue, then realized he has a different table, for ours you have to use the pos and neg z tables.
Thank you for the detailed explanation, Matthew.
Matthew Matlock that really helps!!
@@matthewmatlock4484 thank you so much for taking time to solve my issue too. Im also using full pvalue table
thank you very much for your clear teaching. I will be indeed grateful if you consider my problem .let's consider the function be defined such as g(x,v) where v~N(mu = 150 , sigma=15) how can we find the P(100 - x*v)>0 ?? ... in an article author states the probability 4.29*10^-4
Great tutorial. This really helped me to understand normal distribution and z graphs.
Thank you so so much!!!! This is the best video I have seen so far!
OMG THIS IS GOOD THANK YOU FOR SAVING ME OF MY SCREWED UP LIFE. MY EXAM IS IN LESS THAN 12 HOURS
Perfect! Straight to point explanation. My Professor just reads off a PowerPoint!
Really it was helpful. Thanks a lot Pspollard1.... i am janagan from Sri lanka.
I search lots of videos but finally I got it ...thank u. So muchhhh
This is excellent video..i got full of knowledge about normal distribution through this video..
thank you very much
Thank you for this video. How do you start with a Standard Deviation of 15 though? Is that just as it is. How do you get there?
Studying for the FE. Thanks for your video!
the value you get from the z score table is an area not a distance. Distance in standard deviations enables you to find the area from the table.
thanks for teaching me what my teacher couldn't
thank you so much. this video has helped me heaps. i didnt understand this at all until i watched this. great information
Finally understood how this works!!! THANK YOU SO MUCH!
Thank you so much for the examples! Best video of normal distribution I've found on youtube :)
Love this you explain nice and simply that it looks so easy to understand now...Thanks mate
Should you add or subtract when you are given a problem of "between"? Some teachers stated different kinds of methods.