A university's housing and residence office wants to know how much students pay per month for rent in off-campus housing. The university does not have enough on-campus housing for students, and this information will be used in a brochure about student housing. They obtain a list of the 12, 304 students who live in off-campus housing and have not yet graduated and mail a questionnaire to 200 students selected at random. Only 78 questionnaires are returned. (a) What is the population in this study? Be careful: about what group do they want information? The population is all college students. The population is the 78 students who live in off-campus housing and returned the questionnaire. The population is the 200 college students who received the questionnaire and who live in off-campus housing. The population is all college students who live in off-campus housing.