问题
单项选择题
An analyst does research about hypothesis testing. Which of the following test statistics is most appropriate test statistics for two means based on samples that we believe are dependent
A. T-test.
B. F-test.
C. Chi-square test.
答案
参考答案：A
解析： 两个非独立总体的均值检验也叫做配对检验，用的是t分布检验。例如，检验学员在取得CFA证书前和取得CFA证书后，他们的收入有无差异或者增加多少，可以使用配对检验，这时两个样本并不是独立的：