问题如下图：
选项：
A. 
B. 
C. 
解释：
为什么不是c呢，麻烦老师解答
NO.PZ2017092702000120 问题如下 In the step \"stating a cision rule\" in testing a hypothesis, whiof the following elements must specifie A.Criticvalue B.Power of a test C.Value of a test statisti A is correct. The criticvalue in a cision rule is the rejection point for the test. It is the point with whithe test statistic is compareto termine whether to rejethe null hypothesis, whiis part of the fourth step in hypothesis testing.这道题目有一个背景即题干中的In the step \"stating a cision rule\" ，也就是在 \"stating a cision rule\" （判断是否拒绝原假设）这一步需要确定的是什么。这一步要确定的是criticvalue。这是一个比较机械的结论，需要同学记忆。 显著性水平和criticvalue的区别呢。感觉两个都差不多。一个是拒绝域，一个是定位点，都是方便拒绝原假设
NO.PZ2017092702000120 讲课时候我记得老师说到这一步是算的t statistic的数值，当时觉得有问题 难道是我记混了么
NO.PZ2017092702000120 Power of a test Value of a test statistic A is correct. The criticvalue in a cision rule is the rejection point for the test. It is the point with whithe test statistic is compareto termine whether to rejethe null hypothesis, whiis part of the fourth step in hypothesis testing.我觉得c也是必须要知道的呀，为什么不选c
请问Power of a test是什么东西？ 还有请问stating a cision rule是什么意思？
假设检验的步骤按是C-B-A对吗？
