How do psychologists conduct research? a psychologist studies the effects of exam review strategy on long-term memory. college students are randomly selected and then randomly assigned to one of four groups. group 1 studies using visual information only. group 2 studies using auditory information only. group 3 studies using visual and auditory information. group 4 does not study at all. the students follow the instructions for how they must study for four days to prepare for a 100-question multiple-choice test. they all read the same chapter in the textbook and all take the same exam. exam scores are then recorded.