Researchers are interested in whether caffeine has any effect on short-term memory.A study is designed in which two groups of subjects are given capsules that look identical.Group A receives capsules containing caffeine and Group B receives capsules containing powdered sugar.Group B is being given a:

Question

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Group B is being given a placebo, which is an inactive substance that has no therapeutic effect. In this case, the powdered sugar capsules are being used as a control group to compare the effects of caffeine on short-term memory.

Researchers Are Interested in Whether Caffeine Has Any Effect on Short-Term