问一道题：NO.PZ2015120604000137 [ CFA I ]

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：

0.5%.

5%.

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.

请问是查哪张表？自由度和阿尔法分别是什么？谢谢！

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1 个答案

星星_品职助教 · 2020年10月08日

同学你好，

总体方差未知用t，需要查t分布表。

自由度是t分布的参数，阿尔法是拒绝域，也是significance level，这两个概念课上都讲过，可以复习一下。

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