六、請求出(10%)

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Chia Chung

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2023/04/30

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III (20%) Let Y1 ,Y2 ,Y3 ….,Y n be n uncorrelated random variables with the same mean μ and variance σ2 and denote as the sample average. (i) Find E Y( ) and Var Y( ). (ii) If we define the class of linear estimators of μ as where every ai is constant, if G is an unbiased estimator of μ , what restriction on the ai needed? (iii) Find Var (G ) (iv) Along with (i)-(iii), show that Var G ≥Var ( ) .

六、請求出(10%)

詳解 (共 1 筆)

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