NO.PZ2018062016000124
问题如下：
Which of the following descriptions on a two-tailed hypothesis test is least correct?
选项：
A.
A two-tailed test is less directive than a one-tailed test.
B.
The alternative hypotheses of one-tailed tests has less impacts on the researcher's beliefs than the alternative hypotheses of two-tailed tests.
C.
Under the same significance level, the absolute value of two-tailed test's rejection points is larger than the one of one-tailed test.
解释：
B is correct. A two-tailed test is a “not equal to” alternative hypothesis, while a one-tailed test is a “greater than” or “less than” alternative hypothesis. “greater than” or “less than” alternative hypotheses reflect the beliefs of the researcher more strongly than a "not equal to" alternative hypothesis.
95%的情况下，单尾检验得到1.65不是按照双尾各0.05算的吗？这不是90%的结论吗？单尾检验拒绝域不是对称的吗？只不过只检测一侧？看老师答疑单尾检验好像拒绝域只存在一侧，另一侧没有拒绝域
