If the distribution of the population from which samples of size n are drawn is positively skewed and given that the sample size, n, is large, the sampling distribution of the sample means is most likely to have a:
A. mean smaller than the mean of the entire population.
B. variance equal to that of the entire population.
C. distribution that is approximately normal.
解析：选C。给定一个具有有限方差和大样本容量的总体，中心*限定理确定样本均值的抽样分布近似正态分布，均值等于总体均值，方差等于总体方差除以样本容量。
When ... involving a statistically significant result, the:
A. economic result should be presumed meaningful.
B. statistical result should take priority over economic considerations.
C. economic logic for the future relevance of the result should be further explored.
解析：选C。考察对经济上显着的理解。当一个结果在统计上显着时，应进一步探索其经济逻辑。A项将统计上显着和经济上显着混为一谈。
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