Statistics: Standard deviation | Descriptive statistics | Probability and Statistics | Khan Academy
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- Опубликовано: 22 авг 2024
- Review of what we've learned. Introduction to the standard deviation.
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This channel provides useful and clearly explained info 100% for FREE. These people are literally investing their time and best efforts to create good content, yet people still find "what is wrong" and complain about it instead of appreciating the beauty of education available to everyone
LadyGagaSweetBaby not education, this to me is simply information to pass an exam, then never use it again. But of course im very grateful that mr khan did this for us
Donate to them
Yeah, it the best educational channel on RUclips. We should appreciate their hard work.
@@ubaidshah1910 because you won't go into a field that uses this concept millions of people still have to do this everyday as part of their job its used in real life
About two hours into this program and I've already better learned statistics than a semester of the class.
me too!!!
If you can get your hands on a school curriculum you can learn better for free at home than you would at a college
Hayden Dias don’t hate lol, you’re probs the dumbest kid in your class
@@haydendias4009 haha *you swallow*
Yea
"[Standard deviation] gives us some measure of, on average, how far the numbers are away from the mean"
The most important and useful part of the entire video for me.
Sorry, I'm a little bit confused but isn't that supposed to be the Interquartile range?
Thanks
exactly, this is actually the main thing i was looking for
Thank you for this very simple explanation; Biostatistics is my most challenging course this semester. Khan Academy is God's gift to students. ^_^
Biko ehh and for free
I am taking statistics, now 12 years removed from high school and boy am I thankful for this video lol
The best instructor!
"[Standard deviation] gives us some measure of, on average, how far the numbers are away from the mean" But in the world would you not just calculate exactly how far the numbers are away from the mean?
True but the thing is, sometimes it is not possible to do it for a whole population. Furthermore it is hard to say in one metric how much every point is how far away. That's why the standard deviation is a thing. It is an expression that says for this sample / population the spreadout is this.
Kahn - thank you! My favorite morning ritual for the last couple months has been eating steel-cut oatmeal, drinking coffee, and watching one of your videos. It wakes the brain up in a painless, entertaining way. I'm a piano performance major who once considered being a math major, but never went beyond Calc 3. Having your videos makes me feel like I'm just connected enough to that world I love!
Yo 13 years sense you wrote this how’s life now this comment is old and that’s crazy 1 year ago it came out when you’ll posted this comment it it’s been 14 years time flies also how is life now ya a adult now we’ll have a good day?
Thank you a lot Sal! You secured my exam again! :)
13 years and it keeps usefully!
Who is here because tommorrw is exam 🤔
today actually :(
Tomorrow 😭
Yuppp....
True
me...
Hello Sir, Thank you for this video series. I have looked at other basic statistical videos around this subject, but none of those have explained to this details. Normally a 10 minutes of video also looks long as a persons ages, but your presentation style and detail coverage has bound me to the video. I am still watching the 4th video but have started to get more interested in Stats. Your very purpose of making this video series has achieved more than expected.
Realized this is a video in 2009 when I saw the Windows XP OS. Old but Gold.
p.s. watching this series to reinforce my stat for machine learning/ data science ;))
Shouldn't he have said Khansept? :D
The "n-1 division" is the "degrees of freedom". The reason for this is because you are dealing with a sample. A sample represents a population but it is not a 100% accurate representation that reflects the exact form of the population. So by taking the sample's size and take away 1, we are not underestimating the true value of the population, but rather be more accurate to present our sample standard deviation to be like the population's - making unbiased results. Hope this helped. Go Khan :)
I have to Say this Definitely, You just redefined my current way of Thinking about these Central tendencies and I am getting more and more Sense and am Reaching my Intention for Watching your videos in Particular.
You are an amazing teacher. Thank you very much, i've learned a lot from you.
Thanks a lot!!!! I wish my unversity would hire you to teach statistics....
literally understand everything he teaches on here, rather then how my professor teaches lol
I know that feeling so well...
Feel the same way!!
what is the difference between variance and standard deviation as both states distance from the mean???
soo this video was made in 2009. its 2020 and we are still learning the same thing. wow.
I don't know how to feeeeel.
woow i m currently taking the 6 sigma certifications exam class and to tell you the truth even my teacher couldn't explain this concept as clear as u did. U good!!! thumbs up
I learn more from your videos than I do from my college statistics class. Well done.
Bloody thanks much more simpler explanation than EdX course in statistics 👏🙏
i think i might be better off just skipping my lecture and watching an hour or 2 of this every day
14 yrs old course... STILL VERY USEFUL
I'm a systems engineer in a 3000 level statistics class with a professor who can barely speak English. I have never taken a statistics class before so I find it rather difficult but I learn more from these videos than my prof. This guy can teach it so much better because he knows how to break it down on a beginners level. Thank you Khan!
I am beginning to wonder why pay $6000 per semester when you can youtube anything and get a much better lesson than our overpaid professors!! i am going to start donating to Khan
Sal Khan is The Best Teacher from all the teachers I studied in High School❤️
God Bless You for helping me to understand this!!
I don't mind this type of video actually. I can still learn stuff without high resolution. Gosh people these days. Thanks for your hard work Sal. Best professor ever!
Everytime I watch one of his lectures I feel not worthy. I wish I was as intelligent as him;
I do great in school but this guy knows EVERY subject as if it is as easy as breathing! I envy him with every bone in my body!
Thanks a million!!!! This makes so much more sense than trying to understand from the book.
I'm glad I got the best instructor ever and he makes this course so friggin easy. He has his own equations. Love it!!!
You are the best, i suddenly started my Master's in computer engineering and was i bout to withdrow, after finding what this guy is teaching in math and statistics i had a hop again, u are amazing man, truly amazing by all means, keep it simple like u r doing, u made math truly to be fun.
I am taking my 1st and last class in statistics.
This instructor breaks it down and explains clearly
I wish my professor had the same teaching techniques
I just want to thank you...I have learned more from you in 13 minutes than I have learned for a week's worth of class. ;0) Thanks again!!!
how do you know when to divide by the population (n) or n-1?
Population is always divided by N.
for population divide by n and for sample divide by n-1
Population is always divided using N and n-1 is used to divide sample. You just have to know whether the data is sample or population. If it is sample, then use n-1 and if it is population, then use N.
Sorry for late reply :)
@@muhammedrajab2301 how am I supposed to know whether it's a sample or population?
Thank you very much for spending a precious time to make informative videos like this. I appreciate your hard work!
Great explanation for Finding Standard Deviation in Statistics! Thank you 🙏🏻
Out of all the times I’ve ever used khan academy, I’ve never learned anything
So what's the difference with variance and standard deviation? I know variance is how far away below or above it is from the mean, but what about standard deviation?
Thanks! Love the work so far, learning more than I could have imagined
U really make it UNDERSTANDABLE.... thanks a lot i have a Test tomorrow and im not gonna fail thanks to this videos! cheers man!
I haven't went near math for 3+ years and needed to know this for my psych class. You saved me lol!
Excellent video and great to review right before exams! :)
thank you, Khan! with you, i understand these concepts so much better than a lot of times in my mother tongue. pls keep going. you've promised geometric and harmonic mean in the 1st video) and that's exactly what i need to brush up.
I watch different math videos, and after a while I noticesDthey are all made by the same person, Sal Kahn. How does he find time to do anything else when he is making thousands of these very clear teaching videos?
thank you for saving my time :) i really understand your tutorial {from Egypt}. i study computer science and it really helps me when i don'd understand from my instructor
you are the best 1000 times better than all these professors I've had and paid so much money to, you made me GET IT all the way....I love you for that :))))))
Take it out the word can't. Keep the word Khan. We Khan do it! keep up the good work!
I used khan academy at gcse, and im still using him on my masters course lol
khan academy deserves the world 💓
Not only that. You can rerun our friend here as often as needed. While i do have my physics degree now for over twenty years I am incredibly thankfull for this channel.
Mr. Khan is everything I ever dreamt of when i was studying. Not to mention school.
Merself I cannot decide if to jump out of the chair or not to leave it at all.
Positively addictive stuff.
have a nice day
silk
;-))
Damn I wish the image quality wasn't so shit. Great video though!
+Seán Cahill what does it matter?!
+Dj Vugts It would be more pleasing to look at.....?
+Seán Cahill i think it is a good thing since image quality does nothing here. besides, the people who has slower internet can watch this too.
I have no idea what year or third world country you're living in because there is no argument that makes 240p videos ok.
u r an idiot, dumb dumb tissss
@jazz77ol
I just answered myself. Standard deviation is pretty much the same thing as variance Except it is the square root value of The variance. Further to calculate the variance one would uses the whole population value where the standard deviation 'requires' just the sample value.
I thought someone else may have the same confusion and this might help.
u saved my dream khan...thanks a lot...u r GOD to me...
keep servicing humanity...
thanks, very helpful, especially the subtitle, that helps me alot
Khan is better... at everything
khan academy is a lifesaver
2024 and here I am! The content never gets outdated!
Year 2020........still the best statistics video
I really appreciate the work of this guy ! But i don't understand how he knows every subject like an expert
God bless you. You are vey intelligent!
This info is not just for passing an exam . It clearly is reaffirming what one either already knows, filling in the gap of mis understanding to better understanding or an introduction to something new for better familiarity. I get it.
Besides if yr just doing it to pass an exam without realizing you learned something about yourself well you have missed the point for yourself and what khan academy is trying to accomplish , especially those who are visual learners more so than audio learner
Stepping down off the soapbox now📦
Hahahaha please!
My teacher uses this guy to teach us, never the less you are awesome ;)
With you´re help I finished a 9 page statistics essay in time. Thanks man!
I learned more from Khan Academy than I learned at school. So, thank you sirs
i learned more from this guy in his ten minute videos then from hours of lecture from my numb-nut professors
you know what your the best. I really love all your videos. Honest and they really help me a lot hope youl never stop what you are doing. Your really helping a lot of people
Thanks for stat and prob videos. Please do explain or prove that why variance formula has (n-1) on the bottom?
i NEVER thought i'd understand variance & SD...thank you soooooooooo much. I thought i was done with math 14 yrs ago but it's reared its ugly head. Thank you for making it less painful ;)
n-1 is n= the numbers 1,2,3,8,7.
you just take 1 number away to get 4 numbers instead of the original 5 numbers.
We appreciate your help Mr. Khan. Our app calculates standard deviation just by taking a picture. You can check it out on our RUclips profile page.
His videos still helping many of us
Thank you so much. Your videos about statistics are very good
Biology, physics, chemistry and maths, along with plenty other videos I haven't yet watched - What doesn't Sal Khan teach!?
Here's a tip for my fellow students.
1) At the bottom of this page, click 'Try something new', then switch to HTML5 player.
2) Open up this video again.
3) In setting, choose speed 1.5 or 2
4) ......
5) Profit
things are getting interesting after watching one by one videos
very good explanation. I feels that i shouldn't go to my statistics lectures. because i can understand those stuffs better, than in lectures. thanks. keep up your good work. Cheers.
great explanation! great voice! thank you
old, but gold.
Hey amazing lessons as always, would be amazing if these videos would be upgraded to a better quality though :)
I have the AP stats exam on Friday! What a good way to do some last minute review
I have a question. See if the numbers 1,2,3,4 and 2,2,3,3 were each on separate tetrahedral dice and you rolled them together, which one would have the greatest probability of winning and how would you work that one? Would standard deviation be taken into account?
@ion010101 That's okay, you would say those guys way out there are "x standard deviations from the mean". One of the reasons we use standard deviation in the first place is to determine whether or not a value is "unusual" or not, so a couple guys in a different galaxy don't invalidate the standard deviation at all. Think of sd as a measuring stick calibrated for a specific job. It's only as long or as short as it needs to be.
Yes we KHAN!
You make actually make stat. easy! Thank you!
How does this guy know every subject? Amazing!
This really helped me, thanks so much!
Circumlocution is the major flaw in Khan's otherwise excellent presentations.
I wish he would take steps to reduce the tedious repitition .
loving this playlist, preparation for my midterm Saturday morning.
Amazingly well explained!
Thanks, I really appreciate your works. Keep it going!
Thank you. I got an exam tomorrow and this makes it so easy to understand
holy f**king THANK YOU. been working a real basic st dev problem for 30 mins using tha bullshit my prof gave me and it wasnt working. exam tommorrow im gonna dominate it now
Im in sixth and ive learnt as much as a 10th
I love this guy.
the contrast between the pen color and black is actually much more discernable and memorable to the visual cortex -- please don't use big words if you don't know what you're talking about!
YOU ARE THE BEST KHAN!!!!!!!
Very good video. So is it appropriate to say the standard deviation tells the average distance for the data points from the mean?
that makes sooo much more sense! thank you!
THANK YOU SOOOO MUCH!!!!!!!!!!!!! you have NO IDEA how much this has helped!!!!!!!1