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tchen · 2018年11月25日

问一道题:NO.PZ2015120604000178

问题如下图:

    

选项:

A.

B.

C.

解释:


请教老师,我的思路是,H0:GR>=12.32%,所以是单尾检验,算出test statistic=2.58,则拒绝域是1%,所以选B。请问我错在哪儿了啊=。=

1 个答案

菲菲_品职助教 · 2018年11月25日

同学你好,这个计算出来的其实是Z值,Z值2.58对应的z表上的概率为0.995,这个是小于等于12.32%的概率,那么大于12.32%的概率就是0.005即0.5%。

菲菲_品职助教 · 2018年11月26日

这道题目跟拒绝域没有关系哦,因为这道题考的不是假设检验。这道题其实是运用对一般正态分布进行标准化然后来计算某一概率的知识点。

tchen · 2018年11月26日

可是答案中计算了检验统计量哎,检验统计量是假设检验中用到的吧?所以到底该用正态分布标准化,还是用假设检验的知识点去解题呢?

菲菲_品职助教 · 2018年11月27日

这道题是应该用正态分布标准化的知识点去解题的。答案里面这个统计量确实放在这欠妥,我之后修改下这个答案,感谢提出质疑。

tchen · 2018年11月27日

谢谢!

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