b是什么意思

问题如下：

Which of the following statements about hypothesis testing is correct?

选项：

A.

The null hypothesis is the condition a researcher hopes to support.

B.

The alternative hypothesis is the proposition considered true without conclusive

evidence to the contrary.

C.

The alternative hypothesis exhausts all potential parameter values not

accounted for by the null hypothesis.

解释：

C is correct. Together, the null and alternative hypotheses account for all possible

values of the parameter. Any possible values of the parameter not covered by the

null must be covered by the alternative hypothesis (e.g., H0: μ ≤ 5 versus Ha: μ

> 5). A is incorrect because the null hypothesis is what the researcher wants to

reject; the “hoped for” or “suspected” condition is often set up as the alternative

hypothesis. B is incorrect because the null (not the alternative) hypothesis is

considered to be true unless the sample used to conduct the hypothesis test gives

convincing evidence that the null hypothesis is false.