In the name of ALLAH, the most beneficient, the most merciful

Statistics and Probability (STA301)

Question (select most suitable option)

  Which of the following is an unbiased estimator of population σ2?
\(\sum (x - \bar x)^2 \over n\)
\(\sum (x - \bar x)^2 \over n-2\)
\(\sum (x - \bar x)^2 \over n(n-1)\)
\(\sum (x - \bar x)^2 \over n-1\)