NO.PZ2024120401000012
问题如下:
If you are given a 99% confidence interval for the mean return on the Nasdaq 100 of [2.32%, 12.78%], what is the standard error ?
选项:
A.
2.03%
B.
5.23%
C.
2.57
D.
6.39%
解释:
The mean is the midpoint of a symmetric confidence interval (the usual type), and so is 7.55%.
The 99% CI is constructed as:
The critical value for a 99% CI is 2.57. So standard error = 5.23%/2.57 = 2.03%.
首先,这个题目是在连续随机分布底下的,其次,这里应该就是求标准差吧,为什么要用Standard Error这个词呢?根据何老师在Section 4里讲CLT的时候特别解释的,Estimater的标准差才是标准误,而这里只是求了一个分布的Standard Deviation而已啊,我还因此找了半天的n,用100去算。可以请助教对这个题再进一步解释一下吗?