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yellowjason · 2021年06月20日

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:

A.

The calculated z-statistic for a test of a sample variance when the population variance isknown as: z= X ¯ μ 0 σ/ n 2 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.

知识点跟对应的意思能否解释下,谢谢
1 个答案

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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