An unbiased estimator of a population parameter is an estimator whose variance is the same as the actual value of the population variance.

Name: An unbiased estimator of a population parameter is an estimator whose variance is the same as the actual value of the population variance.
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An unbiased estimator is one whose expected value is equal to the population parameter being estimated. It is not necessary for its variance to be the same as the population variance.

An Unbiased Estimator of a Population Parameter Is an Estimator