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jay1180 · 2022年09月23日

分别讲一下ABC三个选项吧，做对了但是很晕

  1. CFA I
  2. Quantitative

NO.PZ2018062016000144

问题如下：

Which of the following statements on chi-square test is most appropriate?

选项：

A.

It's used in tests concerning the variance of single normally distributed population.

B.

It's not sensitive to violations of its assumptions.

C.

It can use in the condition of the sample which is less random.

解释：

A is correct. The chi-squared test is used in tests concerning the variance of a single normally distributed population. It's sensitive to violations of its assumptions. If the sample is not actually random, the chi-square test are likely to be faulty.

RT，谢谢

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2 个答案

星星_品职助教 · 2022年09月28日

@jay1180

例如卡方分布前提是总体为normal distribution。如果此时总体不是正态分布，例如有偏度，假设检验就会被扭曲，结果不准。

星星_品职助教 · 2022年09月24日

同学你好，

卡方检验的一个主要应用是检验方差是否等于一个确定的数，即A选项。

卡方检验是参数分布，对前提假设敏感，B选项错误。

卡方检验对应的是随机变量，C选项的非随机描述错误。

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