Question: Mathieu participated in a study in which he received a vitamin supplement and then had to lift increasingly heavier weights. He correctly guessed that the

Mathieu participated in a study in which he received a vitamin supplement and then had to lift increasingly heavier weights. He correctly guessed that the vitamin supplement was to help enable him to lift greater weights, so he tried harder to do so. This situation demonstrated the presence of _____. Multiple choice question. demand characteristics negative results participant expectations expectancy effects

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