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What is the difference between the formula for variance and sample variance?

1 Answer

Nov 5, 2015

Degrees of freedom of variance is $n$ but degrees of freedom of sample variance is $n-1$

Explanation:

Note that

$"Variance" = 1/n sum_(i=1)^n (x_i - bar x)^2$

Also note that

$"Sample Variance" = 1/(n-1) sum_(i=1)^n (x_i - bar x)^2$

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