For the following problems, select the best response.

(a) The Bureau of Labor Statistics announces that last month it interviewed all members of the labor force in a sample of 60000 households; 4.9% of the people interviewed were unemployed. The boldface number is a

A. parameter.
B. statistic.
C. sampling distribution.
D. None of the above.

(b) Annual returns on the more than 5000 common stocks available to investors vary a lot. In a recent year, the mean return was 8.3% and the standard deviation of return was 28.5%. The law of large numbers says that

A. if you invest in a large number of stocks chosen at random, your average return will have approximately a Normal distribution.
B. you can get an average return higher than the mean 8.3% by investing in a large number of stocks.
C. as you invest in more and more stocks chosen at random that year, your average return on these stocks gets ever closer to 8.3%.
D. None of the above.

(c) A study of voting chose 663 registered voters at random shortly after an election. Of these, 72% said they had voted in the election. Election records show that only 56% of registered voters voted in the election. The boldface number is a

A. statistic.
B. sampling distribution.
C. parameter.
D. None of the above.