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yehan99 · 2019年03月01日

问一道题:NO.PZ2018091701000086

这个结果是不是算反了?应该是均值减去2.33倍标准差吧,怎么答案是2.33倍标准差减去均值呢?

问题如下图:

    

选项:

A.

B.

C.

解释:



1 个答案

Wendy_品职助教 · 2019年03月01日

习惯上,VAR值为正,公式应该是均值减去2.33倍标准差,之后取绝对值。

答案是为了求得VAR值为正,用2.33倍标准差减去均值呢。

如果对公式的理解比较清楚,按公式记忆就好。

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