Multiple Choice
In an investigation of the effects of caffeine on concentration, half the participants were given regular colas that contained caffeine and half were given decaffeinated colas. In this study, the decaffeinated colas are being used as
A) a confounding variable.
B) a random factor.
C) the dependent variable.
D) a placebo.
Correct Answer:
Verified
Correct Answer:
Verified
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