问题如下:
The table below shows the monthly stock returns of Ivy Corp.
According to the above table ,Calculate the population variance for Ivy Corp. returns, assuming the population has 6 observations?
选项:
A.8.01%.
B.77.1%2.
C.64.2%2.
解释:
C is correct
=[(20- 7.7)2 + (12 - 7.7)2 + (-5 - 7.7)2 + (12- 7.7)2 + (3 - 7.7)2 + (12- 7.7)2] / 6 = 64.2%2
老师,我用计算器按出来的总体的标准差是0.080139,如果平方后不应该是0.006422么?为什么答案是64.22%的平方呢?