NO.PZ2021071601000002
问题如下：
An analyst group follows 250 firms and classifies them in two
dimensions. First dimension is financial leverage, and the second dimension is growth/value types.
To test whether the growth/value typles and financial leverage groups are independent of one another, what is the appropriate test statistic to use in this type of test?
选项：
A.Chi-square test
B.T test
C.F test
解释：
A is correct
The appropriate test statistic is ：
where Oij represents the observed frequency for the i and j group and Eij represents the expected frequency for the i and j group if the groupings are independent.
本题选用的检验量为卡方检验。
上课时老师说独立性检验与相关性检验其实差不多，只是当变量是定性分类时用必须要有独立性检验，这组数据哪里能看出来不是定量的了呢？
