作者zxc95 ()
站内Statistics
标题[问题] 假设检定
时间Sun Dec 20 00:35:57 2009
Some nurses in County Public Health conducted a
survey of women who had received inadequate prenatal
care. They used information from birth certificates
to select mothers for the survey. The mothers that
were divided into two groups : 14 mothers who said
they had 5 or fewer prenatal visits and 14 mothers
who who said they had 6 or more prenatal visits.
Let X and Y equal the respective birthweights of
the babies from these two sets of mothers and assume
that the distribution of X is N(μx,σ^2)and the
distribution of Y is N(μy,σ^2).
请问如果我假设H0:μx-μy=0
那我H1要怎麽假设？
是要设小於0还是大於0？
我承认有点不懂题意
是要实验孕妇在怀孕期间受到关照程度
来跟婴儿体重看是否有显着差异吗？
请教高手
谢谢
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1F：推 Chsieh:如果H0是那样的话 就把=改成≠不就好了？ 12/20 00:58
2F：→ yhliu:可用双边对立假说(≠0), 或亦可用单边对立假说. 12/20 11:00
3F：→ yhliu:就後者而言, "<" 似乎合适, 较少受关照平均出生体重较低. 12/20 11:02
4F：→ yhliu:就习题或考试而言, 题目中应有相关描述可资辨别应采用何者. 12/20 11:03
5F：→ zxc95:我懂了 谢谢 12/21 23:04