Measures of Variability (Variance, Standard Deviation, Range, Mean Absolute Deviation)

An introduction to measures of variability. I discuss the range, mean absolute deviation, variance, and standard deviation, and work through a simple example of calculating these quantities. I then discuss interpreting the standard deviation, including a brief discussion of the empirical rule.
In this video it is assumed that we are dealing with sample data, and not data representing the entire population. This will be the case the vast majority of the time in practice.
The birth weight data is from random sample of 1000 males drawn from Table 7-2 (Live births, by birth weight and geography -- Males) of the Statistics Canada publication 84F0210X, available at \url{www.statcan.gc.ca/pub/84f0210x...}.

[@rampage241]

Thank you so much. I've got mere hours till my mid term and you are saving my life :D

[@brandonsingh1721]

Thank you for the lectures, Getting a good start on the 10-12 hours per week :)

[@manaralghamdi4781]

Good job! Thank you for this AMAZING explanation

[@choiyeonjun655]

Thankyou so much! This is a really big help since I don't understand anything before ... My finals are tomorrow!!

[@adamuboy1224]

Blessed that he is my prof. What a lad. A guru!!

[@kershalramchurren5538]

Brilliant!! You covered everything

[@mjavadbakhshi5546]

SO COOL i have been understand these concepts for a first time correctly.

[@mellonkobugabe5961]

Man, i don't know what i will do for you but may God bless you for sure 🙏

[@Ghostithiz]

Thank you so much this was easy to understand since I was confused from my textbook

[@jbstatistics]

You are very welcome!

[@DrOscarPacheco]

great explanation, and a perfect clean speaker voice at that!

[@danicoleb5394]

Why go to lecture when I can come to KZbin to learn...

[@foodluver7779]

@Mitchell McClinton Apparently not

[@jetstreamsamsung1753]

Fbi open up

[@Daddjess]

you have literally saved me from failing college tysm

[@aliaspopeye0163]

wtf my school is teaching me this in 8th grade bruh

[@trisha4823]

@@aliaspopeye0163 lol same

[@drawingfreak9936]

@@aliaspopeye0163 bro SAME but I am in advanced 7 so I think it’s kinda the same since it covered both year in one

[@drawingfreak9936]

@zRandomTingz - Art & Gameplays!!! yea I’m pretty sure most ppl learn this in 5 or at my school it was like that but they deepen it in middle school

[@voramuj]

Great explanation. Thank you for your videos.

[@ra12312]

thanks for explaining the mean deviation in a simple way, cause i thought im going MAD about trying to find its meaning

[@codewithchase2023]

This was very helpful and clear indeed for any beginner. Thanks a lot, cos I was lost and this just made put me at another level

[@Sky6775]

THANK YOU! from all your DE students. If only there was a video on how to use R software...

[@jbstatistics]

You are welcome Keira. Thanks for the suggestion. I have a couple of videos on R (on a couple of specific topics). More R videos have always been part of the plan, but I'm a little tight on time these days. I'll try to get some up for the next offering. Best of luck on the test!

[@nasrinsetayesh1738]

Thank you. You explained it perfectly :) . Thanks a lot.

[@jbstatistics]

I'm glad to be of help!

[@txtstan680]

are you this video? cuz i needed you right now (desperate to get grades up rizz)

[@kgomotsegodikago2686]

great just the way we are taught in here

[@njabulomagagula1445]

Great explanation,Thank you.

[@jbstatistics]

You are very welcome!

[@medisheen]

Great video! Learned a lot! Thank you

[@saastalkonly]

Thank you So much... It is really very Helpful

[@AJ-et3vf]

Awesome video! Thank you!

[@peterjohnmarbarcelonasanti9334]

Amazing! Thank you so much✊

[@G_anon]

Thank you for this. I guess this would go into an introductory playlist within your KZbin channel (and website alike).

[@jbstatistics]

You are welcome George. Yes, I'll be adding a few videos on basic descriptive statistics and making a descriptive statistics playlist. (I'll be making just a few on descriptive statistics, then get back to other topics.) Cheers.

[@saraabdellatif8115]

thank you for ur helpful lesson ...

[@5sf4bw86]

You know statistics so well to explain it in a common language

[@ahaha731]

Thank god that only this semester I start to take statistic and you upload this video three months ago. Amen. ^^

[@jbstatistics]

I'm glad to be of help!

[@amitpanigrahi5442]

Hello Bro,the way you explained it is fantastic....I would like to as u one thing, please guide me

[@olly41297]

Really great, thanks for your help

[@jbstatistics]

You are very welcome!

[@yasetcaicedo5002]

Great explaination!! Thanks

[@jbstatistics]

You're welcome!

[@paragshah941]

great explaination sir.tysm

[@jbstatistics]

+Parag Shah Thanks for the compliment. I'm glad I could help!

[@ahamedakmal7104]

how will standard deviation of a set of discrete data change -when a value that is equal to the mean is added to data -when a value less than one standard deviation from mean is added to data -when a value that is more than one standard deviation is added to data?

[@monicahmukami7706]

Love this

[@ecommamsgift]

V easy to understand, thank u!

[@jbstatistics]

Glad to be of help!

[@nikitamiller2930]

hi, thanks for this video I have a question, if 0 is part of the sample , do you include it as calculating the mean. The numbers in my data are as follows (0,1,2,3,5,8). Do I include 0 in my calculations

[@nikitamiller2930]

thank you

[@justinexavier5170]

Nikita Miller yeah

[@thorisomakibelo]

Thank you so much sir

[@jrbloggins]

What font are you using? I'm getting flashbacks to linear algebra from 20 years ago from this font. It just screams maths to me lol

[@BrentMabale]

excuse me i have quistion how do you get 57

[@archanamaurya89]

I bet even if you monetise and make more videos, people would still want to learn :) Please please make a video on Bayesian Inference, Markov Chain Monte Carlo :(

[@caryl6463]

I'm sorry I'm very slow in understanding how can you get the 116.6. i divide 350 and 4 on calculator snd it shows 87.5 i badly need help

[@angel123456789164]

A bit late to help, but maybe this comment will help others in the future. You subtract the n-1 first then divide.

[@ahteaching786]

NICE SIR

[@sukoon.mp4]

good luck guys

[@ENR008]

nice thank you

[@jbstatistics]

You are very welcome!

[@lykamananay821]

Where is the 57 come from?

[@jbstatistics]

It's the mean of the 4 numbers in the example.

[@bongoloyama]

2:39 "The sum of the deviations is always 0" That's some black magic stuff. I never noticed before. 😅

[@jbstatistics]

It comes up in all sorts of spots, and is a useful thing to know :)

[@ronilprashanth205]

super

[@jbstatistics]

Thanks!

[@gorilla843]

WOW

[@anthonypopoola2823]

KZbin is good for student to leaning in some area.....

[@anjligupta9278]

Can you explain in hindi

[@jbstatistics]

That's outside of my current skill set :)

[@sids5681]

aa

[@Karriefy23]

Who is watching here when mathanthics doesnt have one?

[@karleencomrie2437]

dummy variable

[@guiltypaper]

Wtf im gr7 and they teach us tbis