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lvlvlv · 2017年02月17日

问一道题:NO.PZ2015120604000178 [ CFA I ]

这道题标准化的时候,为何标准差是标准误standard error?

问题如下图:

    

选项:

A.

B.

C.


1 个答案

源_品职助教 · 2017年02月17日

因为题目问的是“average change”变动的均值, 所以这里需要标准化的变量也是X的均值,所以这里用的标准差就是X均值的标准差,也就是标准误。
  即12%/ (5^0.5 )=5.366%


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