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anyewumian · 2020年02月15日

问一道题: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.


老师,这道题是什么意思呢

1 个答案

星星_品职助教 · 2020年02月15日

同学你好,

这道题目是在问在哪个α的水平下可以拒绝原假设,计算出t-statistics=1.8978,然后跟查表所得的三个临界值逐个对比,发现只有5%的情况下才能拒绝原假设,0.5%和1%都拒绝不了。所以选择B选项

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