NO.PZ2015120604000051
问题如下:
The table below shows part of the monthly stock returns of Ivy Corp.
Calculate the sample variance for Ivy Corp. returns, assuming above table inclues all samples.
选项:
A.8.78%.
B.64.2%2.
C.77.1%2.
解释:
C is correct
= [(20 - 7.7)2 + (4 - 7.7)2 + (-5- 7.7)2 + (12- 7.7)2 + (3 - 7.7)2 + (12- 7.7)2] / (6-1) = 77.1%2
这道题我用stata 算的的时候发现 n=7
我想知道有什么方式可以不用clear the work 使n=6 呢,我返回data界面不知道怎么去改 X7=0 这个input