問題詳情

17. Consider n samples (X1, X2,…, Xn) independently drawn from a distribution with meanμ = 0 and variance σ2 = 1. The following estimator is used to estimate σ2 :
  


What is the minimumn value of n that makes bias of

no greater than 0.01?
(A) 30；
(B)7；
(C)

 is a biased estimnator and so increasing n has no effect on reducing the bias；
(D) n does not matter here；
(E)

 is a biased estimator in frite sample but increasing n can reducethe bias.

參考答案

答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增