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QUESTION

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

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

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