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yellowjason · 2021年06月20日

能解释下A跟C

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.

没看懂选项内容,谢谢
1 个答案

星星_品职助教 · 2021年06月21日

同学你好,

A选项描述的是拒绝原假设的方式。即除非sample证明了要拒绝原假设,否则认为原假设为真(不能拒绝)。这个描述是正确的。

C选项描述的是对于双尾检验何时能拒绝原假设。双尾检验的原假设是等于一个确定的数字(equality),如果是拒绝原假设,应该是证据显示不等于确定数字的时候才拒绝(support inequality),所以C选项说反了。