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.

Which of the following statements is true about the boldface numbers?

(a) 72% is a sample; 56% is a population.

(b) 72% and 56% are both statistics.

(c) 72% is a statistic and 56% is a parameter.

(d) 72% is a parameter and 56% is a statistic.

(e) 72% and 56% are both parameters.