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lldyy · 2023年04月08日

他这个题目说了normally distributed 为什么还选单尾呢 正态分布不是双尾吗

  1. CFA I
  2. Quantitative

NO.PZ2017092702000123

问题如下：

A hypothesis test for a normally-distributed population at a 0.05 significance level implies a:

选项：

A.

95% probability of rejecting a true null hypothesis.

B.

95% probability of a Type I error for a two-tailed test.

C.

5% rejection region in a tail of the distribution for a one-tailed test.

解释：

C is correct.

For a one-tailed hypothesis test, there is a 5% rejection region in one tail of the distribution.

对于单尾的检验（for a one-tailed test），单侧拒绝域是5%。

他这个题目说了normally distributed 为什么还选单尾呢 正态分布不是双尾吗

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1 个答案

星星_品职助教 · 2023年04月09日

同学你好，1)所有分布都是双尾，不能以此做区分；2）significance level=rejection region=probability of Type I error，不受单双尾影响，在选项里找到正确的对应关系即可。

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