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A researcher studying test performance administers a validated anxiety questionnaire to all participants at the start of the session to record their baseline anxiety scores. She then randomly assigns half the participants to complete the test in a quiet room and the other half in a noisy room. In this study, the anxiety questionnaire scores represent a non-manipulated independent variable because the researcher measured rather than assigned participants to anxiety levels.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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