题目
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, and he wants to conduct a hypothesis test at a 1% level of significance. The value of the calculated test statistic is closest to:
选项
A.0.67.
B.0.99.
C.2.00.
答案
B
解析
The test statistic can be calculated without knowing population distirbution: Test statistic=(139750-135000)/(24000/5)=0.99.