In an investigation of the effects of caffeine on concentration,half the participants were given colas that contained caffeine and half were given decaffeinated colas.In this study,what is decaffeinated cola

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Decaffeinated cola is a type of placebo, which is an inactive substance given to the control group in an experiment to ensure that any observed effects are actually due to the treatment being tested (in this case, caffeine).

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