问题如下图：
选项：
A. 
B. 
C. 
怎么判断是单尾还是双尾？这个始终 搞不大懂
解释：
NO.PZ2017092702000123 问题如下 A hypothesis test for a normally-stributepopulation a 0.05 significanlevel implies A.95% probability of rejecting a true null hypothesis. B.95% probability of a Type I error for a two-tailetest. C.5% rejection region in a tail of the stribution for a one-tailetest. C is correct. For a one-tailehypothesis test, there is a 5% rejection region in one tail of the stribution.对于单尾的检验（for a one-tailetest），单侧拒绝域是5%。 0.05 significanlevel，不就意味着type I error的发生概率是5%吗？
NO.PZ2017092702000123 问题如下 A hypothesis test for a normally-stributepopulation a 0.05 significanlevel implies A.95% probability of rejecting a true null hypothesis. B.95% probability of a Type I error for a two-tailetest. C.5% rejection region in a tail of the stribution for a one-tailetest. C is correct. For a one-tailehypothesis test, there is a 5% rejection region in one tail of the stribution.对于单尾的检验（for a one-tailetest），单侧拒绝域是5%。 他这个题目说了normally stribute为什么还选单尾呢 正态分布不是双尾吗
NO.PZ2017092702000123 问题如下 A hypothesis test for a normally-stributepopulation a 0.05 significanlevel implies A.95% probability of rejecting a true null hypothesis. B.95% probability of a Type I error for a two-tailetest. C.5% rejection region in a tail of the stribution for a one-tailetest. C is correct. For a one-tailehypothesis test, there is a 5% rejection region in one tail of the stribution.对于单尾的检验（for a one-tailetest），单侧拒绝域是5%。 如何区分单位还是双尾
NO.PZ2017092702000123 问题如下 A hypothesis test for a normally-stributepopulation a 0.05 significanlevel implies A.95% probability of rejecting a true null hypothesis. B.95% probability of a Type I error for a two-tailetest. C.5% rejection region in a tail of the stribution for a one-tailetest. C is correct. For a one-tailehypothesis test, there is a 5% rejection region in one tail of the stribution.对于单尾的检验（for a one-tailetest），单侧拒绝域是5%。 請問a錯在哪裡?謝謝
NO.PZ2017092702000123问题如下A hypothesis test for a normally-stributepopulation a 0.05 significanlevel implies a:A.95% probability of rejecting a true null hypothesis. B.95% probability of a Type I error for a two-tailetest. C.5% rejection region in a tail of the stribution for a one-tailetest. C is correct. For a one-tailehypothesis test, there is a 5% rejection region in one tail of the stribution.对于单尾的检验（for a one-tailetest），单侧拒绝域是5%。 请问单双尾的拒绝域和查单尾T表和双尾T表是一个概念吗？
