test statistic

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.

选项A是不是错在公式的名称是test statistic, 而不是Z?

是不是只有Z distribution, 没有 Z公式?

谢谢老师

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NO.PZ2015120604000132问题如下Whiof the following is the most accurate statements about hypothesis testing?A.The calculatez-statistic for a test of a single varianis known as: z= X ¯ − μ 0 σ/ n (σ2 is the variance).B.If the computez-statistic = -3 anthe criticz-value = -2, the null hypothesis shoulaccepteC.the probability of the Type I error equals the significanlevel. C is correct. The z-statistic is usefor the test of the menot varian .If the computez-statistic = -3 anthe criticz-value = -2, the null hypothesis shoulrejecte 为什么不选A？没看明白

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