【每日一练】CFA 一级（2015年）

Question：

A sample of 25 observations has a mean of 8 and a standard deviation of 15. The standard error of the sample mean is closest to:
A. 1.60.
B. 3.00.
C. 3.06.

Answer = B 
The standard error of the sample mean, when the sample standard deviation is known, is: 

CFA Level I 
"Sampling and Estimation," Richard A. DeFusco, Dennis W. McLeavey, Jerald E. Pinto, and David E. 
Runkle 
Section 3.1 

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