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Danielle靓靓 · 2018年10月30日

问一道题:NO.PZ2015120604000131

问题如下图:

    

选项:

A.

B.

C.

解释:


提问:老师,这题我查了Z分布表,最接近0.99的这个数字不是0.9901,是0.8389诶。请问这个单尾的Z分布表是怎么看?谢谢指教。

一蒙就对 · 2019年08月24日

妹子你的理解真靓

1 个答案
已采纳答案

菲菲_品职助教 · 2018年10月30日

同学你好,我选取了部分z分布表如下:

在图上我们就能找到对应的数0.9901,然后对应去找纵轴和横轴的数是2.33(纵轴是2.30,横轴对应0.03,所以加在一起就是2.33)。

我知道你为什么查错了,因为你在表上直接按纵轴0.90,横轴0.09去查表了对吧。但是我们要理解这个查表的方式,中间这些四位数的代表的就是概率,就是置信水平,即B选项的99%。所以我们要先在中间这些概率值里面找到跟0.99最接近的一个数,即0.9901,然后在对应横轴纵轴找到对应的z值。下次查表的时候要注意啦~

kevinzhu · 2019年11月10日

那我想问一下双尾检验的话取哪个数字?

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