[問題] 一題數統
We have seen that if Y has a binomial distribution with parameters n and p,
then Y/n is an unbiased estimator of p.To estimator the variance of Y,we
generally use n(Y/n)(1-Y/n).
a.Show that the suggested estimator is a biased estimator of V(Y).
b.Modify n(Y/n)(1-Y/n) slightly to form an unbiased estimator of V(Y).
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a小題是用E(V(Y))這樣算嗎??
b小題n(Y/n)(1-Y/n)不就是不偏??怎麼還要更改
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