Show that (a) 2, the random variable corresponding to 2, is not an unbiased estimator of 2 (b) S2e n2 n2 is an unbiased estimator of 2 The quantity se is often referred to as the standard error of estimate

Question: Show that (a) 2, the random variable corresponding to 2, is not an unbiased estimator of 2; (b) S2e = n2 / n2 is an

Show that
(a) ∑2, the random variable corresponding to 2, is not an unbiased estimator of σ2;
(b) S2e = n·∑2 / n–2 is an unbiased estimator of σ2. The quantity se is often referred to as the standard error of estimate.

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