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yutripley · 2020年10月10日

问一道题：NO.PZ2018062016000123 [ CFA I ]

  1. CFA I
  2. Quantitative

问题如下：

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

选项：

A.

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

B.

Do not have Type I error.

C.

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.

前面有道题不是说one-tailed test是用parameter数据 为什么这里又是选 A？？

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3 个答案

星星_品职助教 · 2021年08月29日

@cynthia

同学你好，提问重复了，无论是单独提问还是针对他人问题提问，提问一次即可。

----------------------

回复复制如下：

C选项的意思是拒绝原假设的原则为|test statistics|＞|critical value|，这个描述是正确的。

如果两者都是正数，就是“greater than”，两者都是负数就是“less than”。正常不会存在一正一负的情况。

cynthia · 2021年08月29日

这里不是说“greater than or less than”吗？这不就是不等于的意思吗？

星星_品职助教 · 2020年10月10日

同学你好，

1. 假设检验是对总体参数（parameter）进行的检验，和单双尾无关

2. 这道题考察的是何时拒绝原假设，如果计算出来的t-statistics的绝对值大于了查表得出的t critical value的绝对值，就拒绝。选择C选项。

如果想引用其他的题目，可以把其他题目截个图。

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