作者janep (XD)
看板Statistics
标题Re: [问题]检定
时间Sat Feb 25 14:19:29 2006
※ 引述《nero (成功不是偶然的...)》之铭言:
: Young Adult magazine states the following hypotheses about the mean age
: of its subscribers.
: Ho : μ=28
: H1 : μ≠28
: If the manager conducting the test will permit a 0.15 probability of
: making TypeⅡ error when the true mean age is 29 , what sample size
: should be selected? Assume σ=6 and a 0.05 level of significance.
: (Note that P(Z≧Za)=a. And Z0.15=1.04 , Z0.05=1.645 Z0.025=1.96 Z0.005=2.576)
: 不知道为什麽就是解不出来
: 或者以说是解出来的答案很奇怪
: 有人可以帮我解答吗
: 谢谢
不过用上面的表似乎查不出来..Z0.075=1.44
P(-1.44<Z<1.44|μ=29)=0.15
P(-1.44< X-29 <1.44)=0.15
------
6/√n
P(Z>1.96 or Z<-1.96)=0.5
X-28 X-29
---- =1.96 ----- =1.44
6/√n 6/√n
√n/6=0.52 n=9.73=10
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 61.57.78.149
※ 编辑: janep 来自: 61.57.78.149 (02/25 14:20)
1F:推 nero:谢谢你..可是原本的题目就是没有这个数字=.= 02/26 01:01