Youtor
The Sample Variance Why Divide by n1
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=9ONRMymR2Eg
An informal discussion of why we divide by n-1 in the sample variance formula. I give some motivation for why we should divide by something less than n, and (casually) discuss the concept of degrees of freedom (in the context of the sample variance). I have another video with a mathematical proof that dividing by n-1 results in an unbiased estimator of the population variance, available at • Proof that the Sample Variance is an ... .
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