Statistics 101: Variance and its Sampling Distribution
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- Опубліковано 5 кві 2013
- In this video, we begin to make inferences about variances. To begin I offer several short, real-world scenarios where variance becomes important in its own right. Next, we compare the sampling distribution of sample means to the sampling distribution of variances. This leads us to a new distribution; the chi-square distribution. We end by learning how to find critical values in the chi-square table. Enjoy!
My playlist table of contents, Video Companion Guide PDF documents, and file downloads can be found on my website: www.bcfoltz.com
#statistics #machinelearning
Your teaching quality has low variance with a mean close to perfectness. Thank you!
repeated the first and last part of the video many times just to hear "you are smart" again and again. thanks you so much
You are! And never forget it. :)
THANK YOU FOR MAKING THESE EDUCATIONAL VIDEOS FREE AND PUBLIC, YOU ARE A GREAT TEACHER!!!!!
Honestly, I was just about to drop out of my inferential statistics course and postpone it to next year (with the problem also being that i haven't even had my descriptive/ probability statistics exam due to corona) but these videos explain everything in such a structured and simple way that I finally get it- even with my mild dyscalculia! I felt so down for the last week and this actually makes me hopeful that I will be able to get good grades if I put enough effort into it. Thank you so much!
Watched many statistics videos but not got satisfaction. hats off to this channel. God bless you. Plus your initial motivation statement at the beginning of videos is very helpful. Thank you very much.
greetings from mexico city, you really motivate me to learn more!!!
You really deserve my first youtube comment. The way you approach education is on another level. Its my first time to recognize that I can see stats
Sherif Hussein Thank you so much! :) I am very happy you find the videos helpful. With perseverance so much is possible. Hang in there you can do it.
The thing that made me so obsessed is that I really don't need in formula sheets anymore I can draw curves and derieve everything thanks a lot I tried adding you on linked in but i couldn't as I didn't know your email thanks alot
I always believed math and stat are more intuitive than are presented nowadays and I keep searching for the most intuitive until I find it. This video is one of such! Many thanks Brandon!!
This is what i call "statistics made easy". Thanks Brandon. You nailed it!!!!
Thank you so much! The world needs more of people like you who are generous in sharing their knowledge!
your teaching is gold
Hello! Thank you for your comment. Yahoo Finance comparison graphs like the one used in the video are basically "% movement from the chosen start point." The start may not always be at zero if the stock gaps from the previous close. For this video the focus is merely on the swing of the percentages..the "band" of their trajectory. Hope that helps! All the best, B.
Thanks Brandon. Truly appreciate your work and luv your style. Easy to listen to, visually clean-your not all over the place :)
Your videos have instilled a love of statistics in me. Thank you and keep up the good work :)
Thank you so much, I absolutely dreaded Statistics despite having survived a Stats class in University. This video really makes me believe that it may be fun to learn and actually easy. You are a great teacher, don't let anyone tell you otherwise. Plan for the weekend: Watch the entire playlist of yours!
Extremely great videos,absolutely high understanding level of stats
Thanks Mr Foltz, this video helps me so much and you make it easier for me to understand Statistic. Thanks a lot.
I am so very appreciative that you've made these videos. Thank you for explaining things in a straightforward manner and taking the time to lay out the fundamentals. Also thank you for starting every video with your acknowledgement that we are achieving, that people are proud of us and we should be proud of ourselves - I have found so much doubt in myself over my inability to comprehend statistics and am overly fearful that I will be unsuccessful in completing my university studies. I am genuinely grateful to have your videos to refer to, I find your explanations careful and easy to understand.
really great Explanation. Thank you Brandon
Searched All over The internet And Finally Found Yu :) Keep Up The Good Work
Perfect!
Thanks a lot!!
Trully you are a teacher!!!
extraordinary explanation ... Thanks Bradon...
Thanks for all of your videos. I am in my first year at university and have been really struggling in my statistics course which has an exam in late may. Your videos have been so clear and precise that i feel confident i will pass now. Thank you so much!
I must tell you that you are awesome. Thank you.
I love your classes
Nice explanation of a week in class material in just under an hour...
Am from Botswana in Africa
respected sir you have solved my many concept
Very helpful videos, thanks Brandon.
+Travis Tatum Awesome. Thanks!
Just Thank you!
Wonderful video
Thanks for the help :)
great videos, reaaaally good explaining all this. I agree with Maddela Daruvu, it'd be cool to have different playlists for each subject, but apart from that, no complaint! Thanks a lot man!
great teacher
Thank you so much
great explanation. very easy to understand
Ali Hassan Excellent. Thank you for watching!
Thanks a ton.
First of all, I would like to say - HUGE THANK YOU for all your work!
I like your videos very much and they seem to be much more approachable than my lectures were. However, I struggle to understand where to begin... You see, with every video I watched there seems to be some before it, that I haven't seen and thus unfamiliar with some key concepts. I try to find those relevant videos and yet again half way through some previous videos are mentioned. Can you possibly give some guidance on where to begin, which videos are pre-requisites for which. In my particular case I am trying to learn about Multiple Regression analysis and Chi Square tests. Given that I have very little prior knowledge of statistics, which videos are a MUST SEE, and importantly, in which order, before I head on to your dedicated videos on the Chi and Multiple Regression?
What is the difference logically between standard deviation and variance if they both measure spread? Variance seems to be less useful since its units are squared. Can you please explain (I havent found a good video on UA-cam distinguishing this yet).
Hi Brandon, thank you for doing these - your delivery style is really easy to follow. I have a couple of questions if thats OK? I have no stats background but just started my Ph.D (comparing different domestic violence programs in terms of their effectiveness). I've been told by some friends that maybe an ANOVA/MANOVA technique is the one to use (will learn this).
Could I kindly seek your thoughts if you think this may be the best avenue (all good that its not concrete just pointing in right direction)
Second question - Which one of your videos do you recommend to start with and work my way up to understand stats for my purpose?
I greatly appreciate your advice!
Dan
Hi, thank you for all the videos. These are amazing. Where can I find all the videos of playlist 11 and playlist 10?
Thank you! very helpful.
I have one question, how do i find the homogeneity of within-subject variance value in an spss output?
Hey Brandon,Many Many Thanx for the awesome series Could you please provide us all the PPTs ....
Thanks
Why cumulative distribution goes from right to left? I can't get it.
i would totally give more likes to the video if youtube allowed... and im only half way into the video! greatly appreciate your effort!
Love you
Would the distribution look the same if for example you plotted the sampling distribution of |s| instead of s^2? I'm trying to figure out in my head exactly why the distribution skews.
Hi Brandon What does numbers 2.7 & 19.023 really indicates, I understand the whole area is 1 then what does these means ?
Thank You for excellent videos. Could you please numbered them so that users can use them sequentially.
can you make a video on sample distributions and explain how to read the graph?
can someone please tell me how those tables were created? i'm lost
Please explain cumulative distribution going from left to right?
Thank you for this video!!! It helps a lot :)
However, I have a doubt in min 15:45. No matter the distribution of the population ( normal, binomial or exponential,etc) the sampling distribution of the mean approximates a normal distribution. So the population distribution does not have to be a normal distribution.
I don't understand the transformation of the ford stock price. What exactly is the stock price divided by to result in a percentage?
Thank you! I do not understand the MEANING of the curve of the sampling distribution of the variances. As I intuitively understand the curve and your lecture, the more observations you will have in each sample, the greater the difference will be between the samples in variance(because the greater the n is, the wider the curve will become). It feels weird. Shouldn't the more observation you will have in each sample make each sample more close to the studied population and hence both the means and variances from each sample would be more close to eachother? I do not study statistics, I am a happy amateur and newbie so I have probably managed to miss some basic thing...
Hi Sir could you please share the ppt used in your presentation
Detailed explanation but i don't what is six sigma means ?
There is no difference between the terms "variance" and "variation"?
5 stars
A. What do you mean by normal population. B. Why in sample variance we have n-1 in denominator
Omg who disliked this video. Show yourself ...
Somebody who bought GE shares!