NO.PZ2015120604000146
问题如下:
Here is a table discribing sample statistics from two bonds' rate of return which are both normally distributed over the past decades. If an investor is considering whether the variance of bond A is greater than 3.24%,
which of the following conclusion is least appropriate (significant level=5%) ?
选项:
A. It is appropriate to use the F-test.
B. The hypothesis is :
C. It is appropraite to use the chi-square test.
解释:
The chi-square test is used to test hypotheses concerning a single population variance.So C is correct.
The null hypothesis can place in whatever you want to reject, so B is correct.
题干问选择least appropriate,So choose A.
X²是检验一个总体的方差的,题目中bondA和bondB是检验两个总体方差,为什么用F分布是不对的呢?错三次了,就是整不明白