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izzyli · 2021年11月06日

没有明白B为何不对，请帮忙解答。谢谢。

  1. CFA I
  2. Quantitative

NO.PZ2015120604000132

问题如下：

Which of the following is the most accurate statements about hypothesis testing?

选项：

A.

The calculated z-statistic for a test of a sample variance when the population variance isknown as: z= X ¯ − μ 0 σ/ n (σ2 is the variance).

B.

If the computed z-statistic = -3 and the critical z-value = -2, the null hypothesis should be accepted.

C.

the probability of the Type I error equals the significance level.

解释：

C is correct.

The z-statistic is used for the test of a sample mean not variance .

If the computed z-statistic = -3 and the critical z-value = -2, the null hypothesis should be rejected.

没有明白B为何不对，请帮忙解答。谢谢。

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1 个答案

星星_品职助教 · 2021年11月06日

同学你好，

拒绝原假设的原则是|test statistic|＞|critical value|，B选项符合这一情况，所以应该拒绝而不是接受原假设。

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