Given that the variance is 289 for a rando
题型：单项选择题
问题：
Given that the variance is 289 for a random sample of 500 stocks. Find out the standard error of the sample mean is closest to:（）
A.0.67.
B. 0.76.
C. 0.99.
Given that the variance is 289 for a random sample of 500 stocks. Find out the standard error of the sample mean is closest to:（）
A.0.67.
B. 0.76.
C. 0.99.