Answer to Question #65105 in Statistics and Probability for Shweta

Question #65105

Let n21X,,X,XK be a random sample with m)X(Ei= and 2i)X(Varσ= for all n,,2,1iK=. Show that )XX(1n1Sn1ii2∑=−−= is an unbiased estimator of 2σ.

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