NO.PZ2017092702000123
问题如下：
A hypothesis test for a normally-distributed population at a 0.05 significance level implies a:
选项：
A.95% probability of rejecting a true null hypothesis.
B.95% probability of a Type I error for a two-tailed test.
C.5% rejection region in a tail of the distribution for a one-tailed test.
解释：
C is correct.
For a one-tailed hypothesis test, there is a 5% rejection region in one tail of the distribution.
对于单尾的检验（for a one-tailed test），单侧拒绝域是5%。
0.05 significance level，不就意味着type I error的发生概率是5%吗？
