刘同学2018-05-22 12:45:51

Investor believes that the mean price of houses in the area is greater than $135,000. A random sample of 25 houses in the area has a mean price of $139,750. The population standard deviation is $24,000. At a 1% level of significance, we should: A Reject the null hypothesis. B Fail to reject the null hypothesis. C Neither rejects nor fails to reject the null hypothesis. 这题答案是否错误？1%对应的应该是2.58吧？