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Researchers want to know how often full-time college undergraduates exercise per week.
What method would be most appropriate to answer their question?
Randomly select five universities and ask all college students in these universities how often they exercise.
Randomly select three universities (one large, one medium, and one small) and ask all college students in these universities how often they exercise.
Obtain a list of all undergraduate college students, number them, and use a random number generator to randomly select $5,000$ college students and ask these $5,000$ students how often they exercise.
Select $10$ students by going to every university bookstore and ask them how often they exercise.
Have surveys at all schools’ health club for the students to fill out when they leave.