A New York psychologist recommends that if you feel the need to check your e- mail in the middle of a movie or if you sleep with your cell phone next to your bed, it might be time to “ power off” ( AARP Bulletin, September 2010). Suppose that you want to learn about the proportion of students at your college who feel the need to check e- mail during the middle of a movie, and that you have access to a list of all students enrolled at your college. Describe how you would use this list to select a simple random sample of 100 students.