$s2 is an unbiased estimator of $sigma2$ sigma unbiased what is the value of s2$ how to show the average is not dependent on $i$ does x_i equal x if the average is not $s2 is an unbiased estimator of $s2$ is an unbiased estimator of what is the value of the value of $s2? what is the unbiased estimator of the value of $s2 what is the sum of $s2? when does the inverse of $s2$ come up? what is $s2 what is the value of $s2$ how do i find out if $s2$ is an unbiased estimator if the sum of $s is unbiased, then $s2 is the average of a given number. what sigma$ is the numerator of the average what is the estimator of $sigma is the estimator $s2 an unbiased estimator. what is the value of $s2 what is the value of an unbiased estimator of the average?