Which one of the following four statements is incorrect in estimation?
The sample mean is an unbiased estimator of the population mean.
The population mean is an unbiased estimator of the sample mean.
The sample variance is an unbiased estimator of the population variance.
The sample variance multiplied by (n – 1)/n, where “n” denotes a finite sample size, is a biased estimator of the population variance.
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