why do we need an unbiased estimator of variance? do we need an unbiased estimator of variance why do we need an unbiased estimator of variance do we really need an unbiased estimator do we need an unbiased estimator do we need an unbiased estimator of the variance? do we need an unbiased estimator of the variance why do i need an unbiased why do you need unbiased do we need an unbiased estimator of the variance why do we need an unbiased estimator unbiased estimator of variance _________ unbiased estimator of variance is not really needed to understand the __________. why do we need an unbiased estimator should we have a unbiased estimator do you need an unbiased estimator of variance why do we need an unbiased estimator why would you need an unbiased estimator of the variance what is the importance of unbiased estimates of variance why we need unbiased estimator