Statistics Fundamentals: The Mean, Variance and Standard Deviation

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:
...Statistical Distributions:
...the Normal Distribution:
...and Population 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:

If you'd like to support StatQuest, please consider a cool StatQuest t-shirt or sweatshirt...


...or buying one or two of my songs (or go large and get a whole album!)


...or just donating to StatQuest!


Lastly, if you want to keep up with me as I research and create new StatQuests, follow me on twitter:

StatQuest,Joshua Starmer,Population Parameters,Estimated Parameters,Mean,Variance,Standard Deviation,Statistics,Machine Learning,Data Science,