Calculating the Mean, Variance and Standard Deviation, Clearly Explained!!!

One of the most basic things we do all the time in Data Analysis (i.e. Statistics, Machine Learning or any other sort of number crunching type thing) is calculate the mean, variance and standard deviation. This StatQuest walks you through these tasks and help you avoid a very common pitfall that is all too easy to fall into.

NOTE: This StatQuest assumes are already familiar with...

...Histograms:    • StatQuest: Histograms, Clearly Explained  
...Statistical Distributions:    • The Main Ideas behind Probability Dis...  
...the Normal Distribution:    • The Normal Distribution, Clearly Expl...  
...and Population Parameters:    • Population and Estimated Parameters, ...  

NOTE: For more details on why dividing by 'n' underestimates the population variance and why we square each term, check out the follow up StatQuest:    • Why Dividing By N Underestimates the ...  

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