See all my videos at www.zstatistics.com :)

This video covers a few pesky concepts that are often glossed over.

0:00 Variance and standard deviation recap
2:39 Why do we bother with "variance" at all (ie. why square stuff)?
6:55 Why do we divide by n-1?
10:47 What do we mean by degrees of freedom?

Spreadsheet downloadable here:
http://www.zstatistics.com/s/Empirica...