问题如下图：
选项：
A. 
B. 
C. 
解释：
感觉没有看懂B、C选项，B这里的have less impacts on怎么理解呢？另外，对于C选项前者的提问和回答感觉和现在的题目不是很对得上，能把B和C再解释一下么谢谢~
菲菲_品职助教 · 2018年12月26日
同学你好，
B选项说的其实是双尾检验比单尾检验更能反映研究者的信念，这个描述其实是错误的。因为单尾检验的备择假设有大于和小于两种情况，而双尾检验的备择假设只是不等于，可能是大于，也可能是小于，没有单尾检验这么明确。所以结论应该是：单尾检验比双尾检验更能反映研究者的信念，也就是说研究的方向会更加明确。
C选项本来想表达的意思应该是：在显著性水平相同的情况下（即α相同），单尾检验的拒绝点即临界值点的绝对值会比双尾检验更小。但是这个选项描述的不太准确，应该改为：Under the same significance level, the absolute value of two-tailed test's rejection points is larger than the one of one-tailed test. 这样就不会有歧义了。
wqd57d · 2019年03月28日
你说的应该改的，不是和C选项一致吗
菲菲_品职助教 · 2019年03月29日
是的，现在的题目已经是修改之后的了。
NO.PZ2018062016000124问题如下Whiof the following scriptions on a two-tailehypothesis test is least correct?A.A two-tailetest is less rective tha one-tailetest. B.The alternative hypotheses of one-tailetests hless impacts on the researcher's beliefs ththe alternative hypotheses of two-tailetests. C.Unr the same significanlevel, the absolute value of two-tailetest's rejection points is larger ththe one of one-tailetest.B is correct. A two-tailetest is a “not equto” alternative hypothesis, while a one-tailetest is a “greater than” or “less than” alternative hypothesis. “greater than” or “less than” alternative hypotheses reflethe beliefs of the researcher more strongly tha \"not equto\" alternative hypothesis.老师，我这样理解是对的吗双尾显著水平5%，置信区间95%；单位显著水平5%，置信区间也应该是95%是吧，但是看其他同学提问下如果解答，感觉是也算上一侧的5%，然后90%得出关键值+-1.65.感觉自己没太弄懂，谢谢！
NO.PZ2018062016000124 问题如下 Whiof the following scriptions on a two-tailehypothesis test is least correct? A.A two-tailetest is less rective tha one-tailetest. B.The alternative hypotheses of one-tailetests hless impacts on the researcher's beliefs ththe alternative hypotheses of two-tailetests. C.Unr the same significanlevel, the absolute value of two-tailetest's rejection points is larger ththe one of one-tailetest. B is correct. A two-tailetest is a “not equto” alternative hypothesis, while a one-tailetest is a “greater than” or “less than” alternative hypothesis. “greater than” or “less than” alternative hypotheses reflethe beliefs of the researcher more strongly tha \"not equto\" alternative hypothesis. 我感觉C 答案也是对的
NO.PZ2018062016000124 问题如下 Whiof the following scriptions on a two-tailehypothesis test is least correct? A.A two-tailetest is less rective tha one-tailetest. B.The alternative hypotheses of one-tailetests hless impacts on the researcher's beliefs ththe alternative hypotheses of two-tailetests. C.Unr the same significanlevel, the absolute value of two-tailetest's rejection points is larger ththe one of one-tailetest. B is correct. A two-tailetest is a “not equto” alternative hypothesis, while a one-tailetest is a “greater than” or “less than” alternative hypothesis. “greater than” or “less than” alternative hypotheses reflethe beliefs of the researcher more strongly tha \"not equto\" alternative hypothesis. 老师这道题的翻译一下吧，看不是很懂
NO.PZ2018062016000124 问题如下 Whiof the following scriptions on a two-tailehypothesis test is least correct? A.A two-tailetest is less rective tha one-tailetest. B.The alternative hypotheses of one-tailetests hless impacts on the researcher's beliefs ththe alternative hypotheses of two-tailetests. C.Unr the same significanlevel, the absolute value of two-tailetest's rejection points is larger ththe one of one-tailetest. B is correct. A two-tailetest is a “not equto” alternative hypothesis, while a one-tailetest is a “greater than” or “less than” alternative hypothesis. “greater than” or “less than” alternative hypotheses reflethe beliefs of the researcher more strongly tha \"not equto\" alternative hypothesis. B的翻译是不是单尾实验对实验者的信仰影响小于双尾实验，那意思就是在单尾实验中实验者更确定自己的偏向对吧？另外题目中的least correct是最不正确的意思对吗？两者是否有冲突？
NO.PZ2018062016000124 问题如下 Whiof the following scriptions on a two-tailehypothesis test is least correct? A.A two-tailetest is less rective tha one-tailetest. B.The alternative hypotheses of one-tailetests hless impacts on the researcher's beliefs ththe alternative hypotheses of two-tailetests. C.Unr the same significanlevel, the absolute value of two-tailetest's rejection points is larger ththe one of one-tailetest. B is correct. A two-tailetest is a “not equto” alternative hypothesis, while a one-tailetest is a “greater than” or “less than” alternative hypothesis. “greater than” or “less than” alternative hypotheses reflethe beliefs of the researcher more strongly tha \"not equto\" alternative hypothesis. 来源: 品职出题 Whiof the following scriptions on a two-tailehypothesis test is least correct?我是用排除法选的B，但是看不太懂B说的是什么意思。