1. The significance level of a test is the probability of rejecting the null hypothesis when it is true. 就是尾部发生的概率,尾部发生了,不能拒绝原假设,原假设为真的概率, 用alpha表示
2. The power of a test is the probability if correctly rejecting the null hypothesis when it is false. 原假设为假,我们拒绝他们的概率。等于1减去原假设为假我们接受的概率,即1减去“第二类错误概率”


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