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：選C。給定一個(gè)具有有限方差和大樣本容量的總體，中心*限定理確定樣本均值的抽樣分布近似正態(tài)分布，均值等于總體均值，方差等于總體方差除以樣本容量。


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：選C。考察對經(jīng)濟(jì)上顯著的理解。當(dāng)一個(gè)結(jié)果在統(tǒng)計(jì)上顯著時(shí)，應(yīng)進(jìn)一步探索其經(jīng)濟(jì)邏輯。A項(xiàng)將統(tǒng)計(jì)上顯著和經(jīng)濟(jì)上顯著混為一談。

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