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Zz12138 · 2024年08月16日

这道题不是检验左侧吗

  1. CFA I
  2. Quantitative

NO.PZ2015120604000137

问题如下：

Ida Lee and his team collect a lot of analysis of statistical data about the car market .According to the data, they come to the conclusion that the mean price of SUV is more than $46,435 in his country. Then they randomly select 64 SUVs whose mean price is $46,760. Assuming the standard deviation of the sample is 1370. Ida Lee conducts a hypothesis test to check their conclusion. At which significant level should Ida Lee reject the null hypothesis?

选项：

A.

0.5%.

B.

5%.

C.

1%.

解释：

B is correct.

If the significant level is 5%, the critical value=1.669<1.8978, Ida Lee should reject the null.

If the significant level is 0.5%, the critical value=2.656>1.8978, Ida Lee will fail to reject the null.

If the significant level is 1%, the critical value=2.387>1.8978, Ida Lee will fail to reject the null.


备择假设是小于，不应该是分布函数左侧面积，应该是小于关键值才才拒绝吗

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1 个答案

品职助教_七七 · 2024年08月16日

嗨，从没放弃的小努力你好：


拒绝原假设的原则是绝对值，即|test statistic|＞|critical value|，拒绝原假设。

正常情况下都不需要去考虑备择假设和拒绝域的位置。

----------------------------------------------
虽然现在很辛苦，但努力过的感觉真的很好，加油！

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