Question: A sample has n =12 scores. The value used in the denominator of the formula for the variance is . The value used in the

A sample has n =12 scores.

The value used in the denominator of the formula for the variance is

The value used in the denominator of the formula for the mean is

Explain why the two formulas use different values in the denominator.

a, The two formulas use different values because the sample mean statistic is a biased estimator of the population mean, and sample variance uses n - 1 to be a biased estimator of .

b, The two formulas use different values because the sample mean statistic is a biased estimator of the population mean, and sample variance uses n - 1 to be a unbiased estimator of .

c, The two formulas use different values because the sample mean statistic is an unbiased estimator of the population mean, and sample variance uses n - 1 to be a biased estimator of .

d, The two formulas use different values because the sample mean statistic is an unbiased estimator of the population mean, and sample variance uses n - 1 to be an unbiased estimator of .

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