维克多周 · 2020年06月14日
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% critical value 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% critical value rejection region in one tail of the distribution.
请问，confidence lnterval不是就代表是双尾吗？为什么c还是对的呢？
星星_品职助教 · 2020年06月14日
同学你好，
confidence lnterval代表是双尾没问题，但这道题考察的是 hypothesis test 。假设检验与置信区间是不同的考点。C选项考察的是“假设检验”下的单尾检验，并不涉及置信区间。
本题题干可以概括为：假设检验里的0.05 significance level代表的是什么意思。C选项的描述为对于单尾检验来说，单尾的拒绝域为5%，这个描述是正确的。
如果是考察置信区间，正确的描述为0.05 significance level代表的代表的是95%的置信区间，即两侧尾部总面积为5%，单侧尾部面积为2.5%。
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？
