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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?

A

Randomly select five universities and ask all college students in these universities how often they exercise.

B

Randomly select three universities (one large, one medium, and one small) and ask all college students in these universities how often they exercise.

C

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.

D

Select $10$ students by going to every university bookstore and ask them how often they exercise.

E

Have surveys at all schools’ health club for the students to fill out when they leave.

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