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A researcher conducts a naturalistic observation study at a local grocery store and notices that shoppers who read nutrition labels also purchase more fresh vegetables. The researcher concludes that reading nutrition labels 'causes' shoppers to make healthier food choices. A peer reviewer evaluates this claim and points out that because the study was a naturalistic observation with no experimental manipulation or control over confounding variables, a cause-and-effect relationship cannot be established. The reviewer's evaluation correctly identifies that this study is severely limited in ________ validity.

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Updated 2026-06-15

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Research Methods in Psychology - 4th American Edition @ KPU

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