Variance and Standard Deviation: Why divide by n-1?
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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...
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