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A study by Schnall and colleagues demonstrates how simple effects analyses can clarify an interaction that renders a main effect misleading. Initially, a main effect indicated that participants in a messy room made harsher moral judgments due to disgust. However, an interaction showed that this effect depended on private body consciousness. By employing simple effects analyses to examine the effect of disgust at each level of body consciousness, the researchers revealed that disgust increased harsh moral judgments only for individuals high in private body consciousness, while it had no effect on those low in private body consciousness.

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