问题如下:
When discerning the difference between population means, then most accurate test is :
选项:
A.z-test.
B.paired comparisons test.
C.chi-square test.
解释:
B is correct. The t-test in this section is based on data arranged in paired observations, and the test itself is sometimes called a paired comparisons test.
如何从题干可以看出是不independent?