Do senior citizens and college students have different memories about high school? The activity Confidence Intervals: 2-Sample Proportions involves investigating random samples from two populations from a large Midwestern city with respect to the question: "When you were in high school, did you have a hero?" How can responses from two random samples from each population be used to estimate the responses of all senior citizens and all college students in this city?

• Students will find and interpret an estimated confidence interval for the difference between two proportions from samples randomly selected from two independent populations.