In an experiment examining how caffeine influences people's perceptions of their own efficiency, one group of participants is given decaf coffee before they make their judgments. This would be classified as a placebo control condition.

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This is because the participants in the placebo control condition are given a substance that has no active ingredients, but is intended to appear to have some effect on the outcome being measured. In this case, the decaf coffee is intended to appear to have caffeine, which is the active ingredient being studied. The purpose of the placebo control condition is to help researchers compare the effects of the active intervention (caffeine) with the effects of an intervention that is expected to have no effect (decaf coffee).

In an Experiment Examining How Caffeine Influences People's Perceptions of Their