NO.PZ2015120604000049
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 + (4 - 7.7)2 + (-5 - 7.7)2 + (12- 7.7)2 + (3 - 7.7)2 + (12- 7.7)2] / 6 = 64.2%2
这题目是不是有歧义呢,好像用n或者n-1都说得通啊。