An Example:
In a study of over 15,000 teens, 62% of boys and 55% of girls consumed sugar-sweetened soda
on the previous day. When asked to compare the boys' percentage with the girls', two students
gave the answers below. Show how each student computed these percentages.
1. Alma: The boys' percentage is 7% bigger than the girls'. 55%
Of which summary statistic is this an example? of probability
2. Bill: The boys' percentage is about 1.13 times more than that of the girls'.
Of which summary statistic is this an example?
Compare each of the two sets of statements. Explain why the first statement is a clearer
interpretation of absolute risk reduction and relative risk reduction, respectively.
3. Absolute risk reduction: