問題詳情

12. For positive random variables X and Y , suppose E (Y / X ) = θ X , which of the following isfalse ?
(A) If a random variable

, then E ( Z ) = θ .
(B) The estimator

is unbiased for θ .
(C) The estimator

is biased for θ .
(D) W2 is not the same as W1 .

參考答案