Question

A researcher wants to study the effects of rewards on motivation and needs to set up two groups: one to receive rewards for its efforts and one to receive no rewards. What procedure should the researcher use to guarantee both groups are essentially equivalent?
a) Put reward-motivated students in one group and the other students in the second group
b) Put students in groups based on perceived response to past rewards
c) Assign group numbers by having students count off by twos
d) Randomly assign students to each group

Answer

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