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PaisleyPPx · 2019年10月07日

问一道题:NO.PZ2015120604000178 [ CFA I ]

问题如下图:

选项:

A.

B.

C.

解释:

老师 我们上课时候背的99%的置信区间对应的点是2.58。有时候做题确实是这样的,但是这道题确实0.995,咋整。

1 个答案

星星_品职助教 · 2019年10月08日

同学你好,

对于这个置信区间对应的几个值,背下来的同时还需要理解。置信区间永远对应的是“两边”,也就是说,中间的区间占了99%,剩下两边一共占1%,也就是单边是0.5%。

而这道题问的是:大于12.32%的概率,即标准化后大于2.58的概率。“大于”对应着是右边那单边,所以对应概率就是0.5%,而不是1%。

其实背的分位点1.65,1.96,2.58,本质上也是查表查出来的。如果这道题没有记住2.58对应99%置信区间,也可以去查Z表,可以对应出2.58对应的左侧面积是99.5%,所以“大于”的部分也就是右侧就是0.5%。

所以关键还是要理解。加油

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