Derrill is worried that variables such as age, gender, personality characteristics, and education level might confound the results of his experiment, which is designed to test the effects of mood on reaction time. Derrill should use ____ assignment to experimental groups to distribute the impact of these ____ variables.?
a. ?random; representative
b. ?representative; random
c. ?representative; representative
d. ?random; random
ANSWER:
d
Psychology
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