Question: Show that the fact that [N/ (N l)]s2 is an unbiased estimator of a2 and that iVs2/a2 is a chi-square variable implies that the

Show that the fact that [N/ (N — l)]s2 is an unbiased estimator of a2 and that iVs2/a2 is a chi-square variable implies that the expectation of a chi-square random variable with IV — 1 degrees of freedom is simply N — 1.

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