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Narcissus · 2018年08月23日

问一道题：NO.PZ2015120604000131 [ CFA I ]

  1. CFA I
  2. Quantitative

请问B选项为什么错？

问题如下图：

选项：

A.

B.

C.

解释：

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1 个答案
已采纳答案

菲菲_品职助教 · 2018年08月23日

同学你好，这个选项说的是在单尾检验下，显著性水平（α）=1%时，Z分布的临界值等于多少，这时候就要查标准正态分布表来得到这个值。所以在表中找到最接近0.99的这个数字（0.9901），可知对应的Z临界值为2.33。你说的这个2.58不是运用在这里的。要运用2.58这个值的地方是在置信区间（confidence intervals）那边，是指大概有99%的数是落在均值周围2.58个标准差范围内的。跟着道题没有关系哦~

加油~

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