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Sima believes that wearing black clothing causes people to behave more aggressively. in her experiment, she randomly assigns people into two groups. in group a, participants are given black shirts to wear, while participants in group b are given white shirts to wear. each participant is then asked to play a violent video game for fifteen minutes and his or her score is computed. in this experiment, each participant's video game score is the variable.

a) dependent
b) random
c) independent
d) confounding

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