3) A study by the National Athletic Trainers Association surveyed 1679 high school freshmen and 1366 high school seniors in Illinois. Results showed that 34 of the freshmen and 24 of the seniors had used anabolic steroids. Steroids, which are dangerous, are sometimes used to improve athletic performance. a. In order to draw conclusions about all Illinois freshmen and seniors, how should the study samples be chosen? b. Give a 95% confidence interval for the proportion of all high school freshmen in Illinois who have used steroids. c. Is there a significant difference between the proportions of freshmen and seniors who have used steroids