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NO.PZ2018062016000123

问题如下：

Which of the following statements about one-side hypothesis test is most correct ?

选项：

We reject the null only if the evidence indicates that the population parameter is smaller or larger than the critical value.

Do not have Type I error.

We reject the null only if the evidence indicates that the test statistic is greater than or less than the critical value.

解释：

C is correct. By definition, one-side hypothesis test also called one-tailed hypothesis test, which reject rule is reject the null only if the evidence indicates that the test statistic is greater than or less than the critical value.

Less than 和 greater than 是不同的区间a

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星星_品职助教 · 2021年04月28日

同学你好，

拒绝原假设的原则是 test statistic 的绝对值＞critical value的绝对值。

所以如果是右尾检验， test statistic和critical value都为正，这时候就是 test statistic is greater than the critical value；

如果是左尾检验， test statistic和critical value都为负，这时候就是 test statistic is less than the critical value。

以上两者结合起来就是C选项的描述。

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