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🤨肖大YAN😊 · 2020年02月16日

问一道题:NO.PZ2015120604000137 [ CFA I ]

请问查的是什么表?

计算出来数值1.8978然后就不知道怎么做了。

谢谢问题如下图:

选项:

A.

B.

C.

解释:

2 个答案

星星_品职助教 · 2020年05月06日

这道题目需要查t表,查t表需要掌握两个关键点:自由度和significance level,然后对应一下就可以。

以这道题为例,df=n-1=63,由于表中没有63这个值,就用临近的60代替。逐个代入significance level0.5%,5%,1%可以得到临界值2.66,1.671,和2.39,然后和计算出来的t统计量1.8978相比较即可。

这个查t表的流程上课时候是讲过的哈。

星星_品职助教 · 2020年02月16日

同学你好,

t分布就查t表。

接下来的步骤就是把算出来的1.8978和查表所得的临界值作比较。以C选项α=1%为例,查出来临界值是2.386。t统计量大于了这个临界值,所以在α=1%的水平上没法拒绝原假设。可以以此类推再查0.5%和5%的临界值,逐个比较,看哪个α水平可以拒绝原假设。

Hugo(Xie Lanzhi) · 2020年05月05日

不会查表,求救。还有就是能不能提个小建议,因为会有查表的问题出现,在讲课的时候能不能重点讲讲如何查表的。一直不是很会

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