Variance and Standard Deviation: Sample and Population Practice Statistics Problems

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Variance and Standard Deviation are all statistical ways of measuring variation. We'll take a look at how to solve practice statistics problems for sample variance, sample standard deviation, population variance and population standard deviation by hand using just your calculator. In our problem we'll take a look at ages of kids at a birthday party. I also mention how to make meaning of this data if they were points somebody scores in various basketball games. Hope that helps.

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When you have a full time job plus attend college full time but you find someone willing to give their time to teach others via YouTube. Thank you for this video, currently taking stats in college.

Dee-yedk
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How hard could've it been for our teacher if he had just explained it this simple?! Thank you so much, man!

sayedalihaider
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It's funny. Sometimes we stay 2 hours in class watching professor explain how to calculate standard deviation and variance. At the end we don't understand very well. Here, 13 min is more than enough for me to understand and gain confidence. Anyway, thank you very much for the video.

fernandomaron
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I'm in Business Economics & Decisoin Science. Roughly over a month. I just understood your 13 min. video of the sample mean, variance, and standard deviation. Over my professor. I was struggling in finding the mean, variance and SD but i see now that is more simple then what I thought. THANK YOU!!!

angelicaibanez
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Thanks, from South Africa here sir! I have been struggling to know, when to use denominator (n-1) or 'n', you explained so clearer than cristal. Thanks now I have peace of mind, you the

hlalelemohale
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My God THANK YOU SO MUCH!! I'm taking Statistical Analysis as a required course 4 hours a week and you broke down this formula in a clear and simple way, that I feel confident in taking my midterm. Thanks again!

munequa
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What a brilliant communicator! Totally recommended. Look forward to checking out more of your videos

AndrewMcNeillMusic
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Thank you much!! I spent a week trying to understand my online stats class and watched this video 1x and now understand perfectly. YOU'RE AMAZING!!!

elesahefner
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That equation looked all kinds of terrifying before you explained what the letters were. I just stared at it in my text book not understanding a single word of it. Now I'm saved. Thank you!

exploringim
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ive been having a hard time understanding standard deviation and variance and am more of a hands on person when it comes to learning. Thank you very much this helped A LOT !

dennisecallejas
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Wow ! Great explanation.... I am currently taking an online class and read the book and had no idea because the formula was driving me crazy! Thank you!

elirivera
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My math teacher is not good as u sir simple yet easy to follow and understand each steps of the way.. thank u ...save. A lot of time and brain ...energy. .

enteryunion
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I had forgotten this simple procedure and I totally couldn't remember
Credits to you

hanesmitter
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Great demonstration! I would like to be as clear as you are when I ever get to teach!

linetgachiuki
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just know that before this I'd used a complicated formula to remember. u saved my time to memorise and understand this thing!!

nurulainnajwasuhaimai
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How did the 27.2 over 4 became 2.607? Did you square root it? How did you exactly got it??

koba
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I loved how you described it, I was able to comprehend through your work fast, but how do you do the frequency that goes in the beginning ? Anyone please let me know thanks 🤓

lovemendez
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I know that you made that video since long time, but I just wanted to say thank you for that, thanks a lot;)

gedeonkibambe
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I really needed this lesson before my STAs exam

nosiphosimelane
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I think this calculation is correct for population, but here since we  have the  sample of numbers so the denominator in the formula is supposed to be not  n,   but n-1 .  Thank you  for clear explanation.

tamaraseid