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What does it mean to say that a sample statistic is an unbiased estimator of a population parameter?

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It means that a statistic calculated from any type of sample will be the same value as the parameter being estimated.


It means that the expected value (mean) of all possible observations of an unbiased sample statistic is equal to the population parameter being estimated.


It means that the average of the squared deviations from the sample mean equals the population variance.


It means that the mean of one sample is an unbiased estimator of the mean of any similar population.

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