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James · 2024年01月01日

b错在哪里？

  1. CFA I
  2. Quantitative

NO.PZ2023061301000027

问题如下：

Which of the following statements is correct regarding the chi-square test of

independence?

选项：

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.

解释：

A is 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.

请问老师，b选项错在哪里呀？

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1 个答案

品职助教_七七 · 2024年01月02日

嗨，努力学习的PZer你好：


独立性的卡方检验的原假设为 two groups are independent。B选项说反了。

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