如题

NO.PZ2015120604000132

问题如下：

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

选项：

The calculated z-statistic for a test of a single variance is known as: $z = \frac{\bar{X} - μ_{0}}{σ / \sqrt{n}}$ (σ² is the variance).

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

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 the mean not variance .

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

为什么不选A？没看明白

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1 个答案

品职助教_七七 · 2024年11月06日

嗨，爱思考的PZer你好：

A选项要检验的是方差，检验方差（test of a single variance）需要使用的是卡方分布以及卡方统计量，不使用z统计量。

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