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Show that E(s2)-σ2 in simple random sampling, where the sample variance s* is defined with n 1 in the denominato 2 is defined with N-1 in the denominator. [Hint: Write yi-y as yi-μ- σ-μ), verify that r and the population variance σ 17 and cither take espectation over all pouible samples or define an indicator variable for each unit, indicating whether it is included in the sample.]

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2 consider 2. 2. 21dj-시)2.th(g-从八-2(F-n) (ny-na) }.,划і th丁.\ h-1 h-l) P h-I 2.

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