作者bboylu (小路)
看板Statistics
标题[商管] [统计]-卡方适合度检定和检定取样本问题
时间Sun Oct 31 02:36:40 2010
※ [本文转录自 Grad-ProbAsk 看板 #1Cp64jvh ]
作者: bboylu (小路) 看板: Grad-ProbAsk
标题: [商管] [统计]-卡方适合度检定和检定取样本问题
时间: Sun Oct 31 02:17:14 2010
第一题
下面资料是各个年龄层购买球赛门票的资料
试以卡方适合度检定分配呈常态分布 alpha = 0.05
年龄区间 频率
10-20 16
20-30 44
30-40 61
40-50 56
50-60 35
60-70 19
这题没有给平均也没给变异
就算分成八等份也不知道要怎麽下手= =
第二题
The manufacture manager in the CocaCola Company suspected that the new
bottling process produces under-filled cans of caca-cola. Based on the most
recent collected data of 100 cans of regular 12-oz Coca-Cola, the sample mean
is 11.95 oz and the sample standard deviation is 0.1 oz.
When testing H0: u=12 oz vs. H1: u<12 oz, what is the minimum sample size
needed to guarantee that the power of the test will be at least 90%
in order to detect the true u=11.98 at alpha = 0.05?
题目里面有写到的u都是母体期望值
S(Zalpha + Zbeta) 2
这题如果我题目没会错意的话应该是要求n= (－－－－－－－－－－)
11.98-12
如果有错请纠正@@
我想问一下alpha和beta怎麽求@@
谢谢
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1F：推 papapapain:a=0.05 B=0.1 02/27 03:49