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sarafung · 2024年08月23日

请问此题需要记住t-test表的5%、1%、0.5%对应的数值吗？

  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.


请问此题需要记住t-test表的5%、1%、0.5%对应的数值吗？

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2 个答案

品职助教_七七 · 2024年09月20日

嗨，努力学习的PZer你好：


@花儿。

总体方差已知才能用z。本题方差未知，只能用t。

大多数题目中，总体方差都是未知的，也就是和这道题情况类似。

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努力的时光都是限量版，加油！

品职助教_七七 · 2024年08月24日

嗨，爱思考的PZer你好：


不需要。t分布没有固定的关键值，需要根据Critical value和significance level查t表。

t表可从教材的附录中获取，或直接从学员资料下载处下载。

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虽然现在很辛苦，但努力过的感觉真的很好，加油！

花儿。 · 2024年09月20日

这题为什么查的是t表而不是z分布表呢

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