What do we mean by an unbiased statistic?
A) a statistic that equals the sample mean
B) a statistic whose average is very stable from sample to sample
C) a statistic used to measure racial diversity
D) a statistic whose long range average is equal to the parameter it estimates

Question

Quizplus · Accepted Answer

An unbiased statistic is a statistic whose long range average (over all possible samples of the same size) is equal to the parameter it is estimating. This means that, on average, the statistic will give a correct estimate of the population parameter without consistently over or underestimating it. Choices A, B, and C do not accurately describe what an unbiased statistic is.

What Do We Mean by an Unbiased Statistic