Exercise:
　　A sample has the following characteristics
　　The mean of the sample is 2.5%.
　　Standard deviation is 1.5%.
　　400 observations in the sample.
　　Which is the standard error of the mean estimate?
　　A.0.125%
　　B.0.088%
　　C.0.053%
　　D.0.075%
　　Answer: D
　　Explanation:

 
　　相关知识点：Standard Error of the Mean
　　The standard deviation of the sampling distribution of the sample means is called the standard error of the sample means. Standard error of the mean is usually estimated by the sample standard deviation divided by the square root of the sample size (assuming statistical independence of the values in the sample):

{C}{C}{C}{C}

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