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喧嚣 · 2023年03月28日

C错在哪了啊

NO.PZ2015120604000138

问题如下:

The following table shows a set of data usd for a statistical test.

When conducting a hypothesis test to tell whether the population mean is equal to 8.5, which of the following alternative hypothesis is most appropriate?

选项:

A.

Ha: μ8.5

B.

Ha: μ8.9 hours.

C.

Ha: μ>8.5.

解释:

A is correct.

A two-tailed test is used for telling whether the population mean is equal to 8.5.

感觉AC都对啊,题目也没说一定要双尾啊

1 个答案

星星_品职助教 · 2023年03月28日

同学你好, 题干中要求检验的是是否"equal to 8.5",所以原假设只能是等于8.5。与此对应,备择假设只能是不等于8.5,不能是大于或小于8.5。

喧嚣 · 2023年03月31日

好的~谢谢老师

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