Q15. An analyst gathered the following information about a stock index: Mean net income for all companies in the index $2.4 million Standard deviation of net income for all companies in the index $3.2 million If the analyst takes a sample of 36 companies from the index, the standard error of the sample mean is closest to: A. $66,667 B. $88,889 C. $400,000 D. $533,333
答案和详解如下：
Q15 D 07Modular Level I, Vol.1, PP 426-427 Study Session 3-10-e The standard error of the sample mean is equal to the population standard deviation divided by the square root of the number of observations in the sample: $3,200,000/√36=$533,333.
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发表于 2007-11-5 18:39
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