作者NiceKitty (想要有個依靠><)
看板Grad-ProbAsk
標題[商管] 統計學-西葛馬問題
時間Thu Jan 14 00:06:01 2010
不好意思再請教各位大大一題><
Consider n independent trials,each of which results in any of the
outcomes i, i=1,2,3 with respective probabilities P1,p2,p3
3
ΣPi=1.Let Ni denote the number of trials that result in outcome i,
i=1
and show that Cov(N1,N2).
Also explain why it is intuitive that this covariance is negative.
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1F：推 locust0923:用三項分配去解就好了 01/14 09:45