NO.PZ2015120604000140
问题如下:
Here is a table shows a set of data. Peter sets up a null hypothesis--- H0: μ≥8.5. What is the calculated test statistic?
选项:
A.
1.7877
B.
-1.7877
C.
2.3656
解释:
A is correct.
The test statistic: .
分子为什么要用样本的均值减去假设的数字而不是用总体的均值减假设的数