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六粒橙 · 2018年07月31日

问一道题：NO.PZ2015120604000131 [ CFA I ]

  1. CFA I
  2. Quantitative

问题如下图：

    

选项：

A.

B.

C.

解释：

老师你好，请问B中2.33怎么得出的？ α=1%时，confidence interval = 99%那么 Z分布中对应的critical value 不是2.58吗？请问我哪里理解错了。谢谢！


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菲菲_品职助教 · 2018年07月31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~

六粒橙 · 2018年08月01日

明白了 谢谢！！

蓝莓囡囡骑士 · 2018年12月12日

可是题目没有给查表的数据 考试怎么办啊 

菲菲_品职助教 · 2018年12月12日

考试的时候都会给出的哦，不用担心。

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