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GU · 2021年07月03日

A没有看懂，可以详细解释一下吗

  1. CFA I
  2. Quantitative

NO.PZ2015120604000132

问题如下：

Which of the following is the most accurate statements about hypothesis testing?

选项：

A.

The calculated z-statistic for a test of a sample variance when the population variance isknown as: z= X ¯ − μ 0 σ/ n (σ2 is the variance).

B.

If the computed z-statistic = -3 and the critical z-value = -2, the null hypothesis should be accepted.

C.

the probability of the Type I error equals the significance level.

解释：

C is correct.

The z-statistic is used for the test of a sample mean not variance .

If the computed z-statistic = -3 and the critical z-value = -2, the null hypothesis should be rejected.

A没有看懂，可以详细解释一下吗

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2 个答案

星星_品职助教 · 2021年07月05日

@GU

回复追问：

拒绝原假设的原则是|test statistics|＞|critical value|，本题|test statistics|=3，|critical value|=2，所以要拒绝原假设，即B的描述错误。

星星_品职助教 · 2021年07月03日

同学你好， 这道题说的不好，想考察的知识点是检验方差是否要用到z统计量。 检验variance(是否等于一个确定的数)用的是卡方检验，应用的是卡方统计量，不需要计算z统计量。z统计量用的是检验均值是否等于一个确定的数。 掌握知识点即可。

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