NO.PZ2017092702000121
问题如下：
Which of the following statements is correct with respect to the null hypothesis?
选项：
A.It is considered to be true unless the sample provides evidence showing it is false.
B.It can be stated as "not equal to" provided the alternative hypothesis is stated as "equal to."
C.In a two-tailed test, it is rejected when evidence supports equality between the hypothesized value and population parameter.
解释：
A is correct.
The null hypothesis is the hypothesis to be tested. The null hypothesis is considered to be true unless the evidence indicates that it is false, in which case the alternative hypothesis is accepted.
为什么可以认为Ho是真的呢？更准确来说不应该是fail to reject吗？
