If the population variance σ² is unknown,a sample variance s² is a better estimator of σ² if the denominator is s² formula is (n - 1)rather than n.

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Quizplus · Accepted Answer

This is true. Using the denominator (n-1) in the formula for sample variance results in an unbiased estimator for population variance. Using the denominator n makes the estimator biased, as it underestimates the population variance.

If the Population Variance σ2 Is Unknown,a Sample Variance S2

If the Population Variance σ² Is Unknown,a Sample Variance S²