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: μ≠8.5
B.
Ha: μ≠8.9 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