Question

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

Answer 1

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`