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W = W(X) be any unbiased estimator of 0 and let T = T(X) be a sufficie istic. Define the unbiased estimator v(T) = E(W

W = W(X) be any unbiased estimator of 0 and let T = T(X) be a sufficie istic. Define the unbiased estimator v(T) = E(W | T). Show that for all 0, 4(7 less variance than W

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