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mitmit · 2020年02月28日

问一道题:NO.PZ2017092702000124

问题如下:

Which of the following statements regarding a one-tailed hypothesis test is correct?

选项:

A.

The rejection region increases in size as the level of significance becomes smaller.

B.

A one-tailed test more strongly reflects the beliefs of the researcher than a two tailed test.

C.

The absolute value of the rejection point is larger than that of a two-tailed test at the same level of significance.

解释:

B is correct.

One-tailed tests in which the alternative is "greater than" or "less than" represent the beliefs of the researcher more firmly than a "not equal to" alternative hypothesis

为什么A不对呀,confidence level减小了,双尾对应的会变大吧。。。

1 个答案

星星_品职助教 · 2020年02月28日

同学你好,

这道题是假设检验,和置信区间不是一个考点,需要做区分。

level of significance(α)对应拒绝域的面积,如果α从10%下降至5%,等价于拒绝域的面积也下降至5%,所以应该是“decrease in size”

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