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In an Investigation of the Effects of Caffeine on Concentration,half

Question 205

Multiple Choice

In an investigation of the effects of caffeine on concentration,half the participants were given regular colas which 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.

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