发布时间:2025-06-26 15:04编辑:融跃教育CFA
CFA一级定量分析例题chi-square test of independence
Which of the following statements is correct regarding the chi-square test of independence?
A The test has a one-sided rejection region.
B The null hypothesis is that the two groups are dependent.
C If there are two categories, each with three levels or groups, there are six degrees of freedom.
答案:A
解析:Ais correct. The test statistic includes squared differences between the observed and expected values, so the test involves only one side,the right side. B is incorrect because the null hypothesis is that the groups are independent, and C is incorrect because with three levels of
groups for the two categorical variables, there are four degrees of freedom.
关联考点:Parametric and Non-Parametric Tests of Independence
易错点分析:
通常,我们使用列联表来检验两个特征之间是否存在独立性,例如在一个包含earnings growth和dividend yield的表中。原假设是这两个特征是独立的;检验的自由度由两个特征的组数决定,计算公式为自由度df = (r-1)(c-1),其中r和c分别是两个特征的组数。
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