Fix It Dr. Parmentier Wants to Know If Exercise Improves Memory. He

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Dr. Parmentier wants to know if exercise improves memory. He recruits 30 undergraduates from his university and puts the name of each student in a hat. The first student he selects is assigned to an exercise condition. The next student he selects is assigned to the inactive control condition. He repeats this process until all students are assigned to one of the two conditions. Participants in the exercise condition are taken to the university's gym and told to exercise for 30 minutes. The gym has a variety of exercise equipment, including treadmills, elliptical trainers, stationary bikes, and strength training machines for them to use.
What type of sampling method did Dr. Parmentier use? How did Dr. Parmentier assign participants to treatment conditions? What is the problem with how the researcher defines exercise? How would you fix it?