A study of 3,005 adults ages 57 to 85 showed that 82% of them use at least one prescription drug. The margin of error is 2 percentage points (based on data from "Use of Prescription and Over-the-Counter Medications and Dietary Supplements Among Older Adults in the United States," by Qato, et al., Journal of the American Medical Association, Vol. 300, No. 24).

a. Based on the given information, state what you think was the goal of the study. Identify a possible population and the population parameter of interest.

b. Briefly describe the sample, raw data, and sample statistic for the study.

c. Based on the sample statistic and the margin of error, identify the range of values (confidence interval) likely to contain the population parameter of interest.