作者detecter (韩岚侥)
看板Statistics
标题[问题] 中央统研考古题
时间Wed Jan 24 14:02:17 2007
题目:
Y=ΣXi,i=1 to n, where {Xi} are random sample from Poisson(u)
Show that the variance of √(Y/n) is essentially free of u for large n.
请问该从哪下手??
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1F:推 chrisjon:求√Xbar的变异数跟求Xbar的变异再取根号一样吗? 01/24 14:09
2F:→ chrisjon:如果一样的话,应该直接lim後取变异再开根号就行了 01/24 14:11