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lmlhj · 2019年03月24日

问一道题:NO.PZ2015120204000022

问题如下图:

    

选项:

A.

B.

C.

解释:


虽然这道题做对了,但是有点蒙的,请问应该怎么区分是单尾还是双尾?

1 个答案

菲菲_品职助教 · 2019年03月25日

 

同学你好,可以看一下t分布表:

这里教你一个小窍门,我们可以发现,0.025只会出现在单尾,不会出现在双尾,所以如果给的表里面有0.025,就一定是单尾的。(但是这道题已经告诉你了表格是单尾的)

所以下一步,就是用单尾的数据来找到双尾对应的临界值。比如说这道题给的是5%的显著性水平,那么查表的时候就要用0.025的那行的数据。

而且这道题目问的是置信区间,就一定是双尾的。

66教主 · 2019年05月02日

0.025只会出现在双尾吧?

菲菲_品职助教 · 2019年05月04日

对是的。

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