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　　Which of the following statements about the central limit theorem is least
　　likely correct?
　　a. The variance of the distribution of sample means is s2 / n.
　　b. The central limit theorem has limited usefulness for skewed
　　distributions.
　　c. The mean of the population and the mean of all possible
　　sample means are equal.
　　d. When the sample size n is large, the sampling distribution of the sample means is approximately normal.
　　答案解析：选b
　　The central limit theorem holds for any distribution as long as the
　　sample size is large (i.e., n > 30). (See Book 1, Topic 12)
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