看不懂选项是什么意思，为什么B正确C错误。

问题如下：

Which of the following statements regarding the null hypothesis is correct?

选项：

A.

It can be stated as “not equal to” provided the alternative hypothesis is

stated as “equal to.”

B.

Along with the alternative hypothesis, it considers all possible values of the

population parameter.

C.

In a two-tailed test, it is rejected when evidence supports equality between

the hypothesized value and the population parameter.

解释：

B is correct. The null and alternative hypotheses are complements of one another

and must be both mutually and collectively exhaustive. Differently put: all possible

values or outcomes need to be contained in either the null or the alternative

hypothesis.

A is incorrect because the null hypothesis must always include the equality

sign (less than or equal to, equal to, or greater than or equal to). C is incorrect

because, in a two-tailed test, the null hypothesis is generally set up as equality between

the hypothesized value and the population parameter. If evidence supports

equality, then the null hypothesis would not be rejected.