B选项怎么看呢，我认为是相等的，那么备择假设就是等于号，但是不是说Null必须包含等于号吗？

问题如下：

Which of the following statement is most likely choose one-tailed test?

选项：

A.

to test the hypothesis that the mean price of houses is greater the $500,000

B.

to test the hypothesis that the mean price of houses is equal to $500,000

C.

to test the hypothesis that the mean price of houses is not equal to 500,000

解释：

A is correct, if alternative hypothesis is greater than or less than, one-tailed test will be taken.