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Tan · 2020年08月26日

问一道题:NO.PZ201709270100000301

* 问题详情,请 查看题干

问题如下:

1. Based on Exhibit 1 and given Varden’s expectations, which is the best null hypothesis and conclusion regarding CEO tenure?

选项:

A.

b2≤ 0; reject the null hypothesis

B.

b2 = 0; cannot reject the null hypothesis

C.

b2 ≥ 0; reject the null hypothesis

解释:

A is correct. Varden expects to find that CEO tenure is positively related to the firm’s ROE. If he is correct, the regression coefficient for tenure, b2, will be greater than zero (b2 > 0) and statistically significant. The null hypothesis supposes that the "suspected" condition is not true, so the null hypothesis should state the variable is less than or equal to zero. The t-statistic for tenure is 2.308, significant at the 0.027 level, meeting Varden’s 0.05 significance requirement. Varden should reject the null hypothesis.

这道题是单尾检验在significant level 5% (拒绝域左边5%),请问所以T值应该是相当于双尾10% 也就是1.65了吗?一级有些忘记了,谢谢

2 个答案

星星_品职助教 · 2020年08月31日

@Tan

你的理解是单侧拒绝域的面积,但如果要查表,还要看题目给你的t表是单尾的还是双尾的。

这道题目跟查表没有关系,可以等做到有具体涉及查表的题目具体研究讨论一下。

星星_品职助教 · 2020年08月28日

同学你好,

要看查的是单尾还是双尾的t表。如果给的就是单尾t表,那么直接对应单尾5%。如果给的是双尾t表,那么双尾一共10%就相当于单尾是5%。

由于原版书给的是单尾t表,所以单尾查表更重要一些。

但在给了p-value的情况下,不需要再去查表,直接比较p和α就可以了。p越小越拒绝

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