c选项没看懂是什么意思，可以解释下么，谢谢

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 sample variance when the population variance isknown 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 a sample mean not variance .

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

知识点跟对应的意思能否解释下，谢谢

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星星_品职助教 · 2021年06月21日

同学你好，

C选项是定义。the probability of the Type I error的大小等于significance level，即平常所说的α。

例如置信区间为95%，则此时α=5%=significance level，则此时probability of the Type I error就也为5%

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NO.PZ2015120604000132 没有明白B为何不对，请帮忙解答。谢谢。

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NO.PZ2015120604000132 A没有看懂，可以详细一下吗

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c选项没看懂是什么意思，可以解释下么，谢谢

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