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倍儿棒 · 2020年03月14日

问一道题:NO.PZ2018062016000123 [ CFA I ]

问题如下:

Which of the following statements about one-side hypothesis test is most correct ?

选项:

A.

We reject the null only if the evidence indicates that the population parameter is smaller or larger than the critical value.

B.

Do not have Type I error.

C.

We reject the null only if the evidence indicates that the test statistic is greater than or less than the critical value.

解释:

C is correct. By definition, one-side hypothesis test also called one-tailed hypothesis test, which reject rule is reject the null only if the evidence indicates that the test statistic is greater than or less than the critical value.

请问这道题为什么选c,不选a? 课件上关于one-tailed的那一页,注意里讲的是“ for population parameter not sample statistic ” ; 教材里关于one-tailed hypotheses test 的原文叙述是“In contrast, Formulations 2 and 3 are each a one-sided hypothesis test (or one-tailed hypothesis test). For Formulations 2 and 3, we reject the null only if the evidence indicates that the population parameter is respectively greater than or less than θ0.”
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星星_品职助教 · 2020年03月15日

同学你好,

做假设检验的过程是用计算出来的test statistics去和critical value作比较,这也是课上讲的假设检验的步骤。

做假设检验目的是检验总体参数,但并不是用总体参数去直接比较。

倍儿棒 · 2020年03月15日

谢谢,知道了

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