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Falcon · 2018年12月13日

问一道题:NO.PZ2015120204000015

问题如下图:

    

选项:


A.

B.

C.

解释:


这道题单尾检验的拒绝域为什么在左边而不是右边        

2 个答案
已采纳答案

菲菲_品职助教 · 2018年12月15日

同学你好,是这样的。因为题目中有一句话说,Hansen相信,the initial return will increase less by 0.5 percent,而假设检验想检验的就是这句话。所以原假设是大于等于0.5,备择假设是小于0.5,所以是单尾检验,并且拒绝域在左边。所以其实拒绝域在哪边不是根据bj的值0.435来决定的,也就是说,不是根据t统计量的值来决定,而是根据他想要检验的东西来决定的。这其实考察的是一级的内容,可以再去回忆一下假设检验如何确定原假设和备择假设的内容哦。

Feeling · 2019年01月20日

为社么拒绝域在左边呢?

菲菲_品职助教 · 2019年01月21日

因为它的备择假设的符号是小于,所以拒绝域在左边。拒绝域在哪边是看备择假设的符号的,如果是大于就是在右边。

Falcon · 2018年12月13日

如果bj不是0.435,而是比0.5大的数,比如0.535,那么拒绝域是在右边吗?

菲菲_品职助教 · 2019年01月21日

不是的,拒绝域在哪跟这个bj系数是多少是没有关系的,而是跟备择假设相关。

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