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骄阳 · 2017年09月28日

问一道题:NO.PZ2015120604000178

看到了percentage changes 与 average 的区别,但是解释不太明白,求详细解释

问题如下图:

    

选项:

A.

B.

C.

解释:



1 个答案
已采纳答案

源_品职助教 · 2017年10月01日

首先对问题做标准化P(X15.5%)=Z(X>1.96)

接着差正太分布表,1.96关键值对应的单尾概率为2.5%

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