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VincentShell · 2022年12月14日

请老师翻译一下

NO.PZ2018062016000124

问题如下:

Which of the following descriptions on a two-tailed hypothesis test is least correct?

选项:

A.

A two-tailed test is less directive than a one-tailed test. 

B.

The alternative hypotheses of one-tailed tests has less impacts on the researcher's beliefs than the alternative hypotheses of two-tailed tests. 

C.

Under the same significance level, the absolute value of two-tailed test's rejection points is larger than the one of one-tailed test.

解释:

B is correct. A two-tailed test is a “not equal to” alternative hypothesis, while a one-tailed test is a “greater than” or “less than” alternative hypothesis. “greater than” or “less than” alternative hypotheses reflect the beliefs of the researcher more strongly than a "not equal to" alternative hypothesis.

老师这道题的选项翻译一下吧,看不是很懂

1 个答案
已采纳答案

星星_品职助教 · 2022年12月15日

同学你好,

A选项的描述为双尾检验不如单尾检验有方向性或指向性。这个描述是正确的,双尾检验只能看出不等于的关系,确定不了是大于还是小于。而单尾检验可以直接得出具体的方向。

B选项的描述为相对于单尾检验,双尾检验的备择假设更能反应出研究者对于该研究的信心程度。这个描述说反了,原因和A选项是一样的,即单尾检验有明确的指向性,所以是更能反应研究者信心的一方。

C选项的描述为当significant level相同时,双尾检验的关键值(的绝对值)要比单尾检验的大。这个描述也是正确的。用正态分布下5%的significant level作为例子就可以看出,双尾检验的关键值(的绝对值)为1.96,单尾的关键值为1.645,所以确实是双尾的大。

由于本题要选择“least correct”,所以选择B选项。

-----

此后提问需要具体说明每个选项及答案解析(如有)看不明白的地方。

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