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A peer reviewer evaluates a research draft concluding that 'higher levels of optimism directly lead to longer life spans' based on a correlational survey. The reviewer determines this conclusion is invalid because the study design is restricted to a(n) _____ statistical relationship, where the researcher must observe variables as they naturally exist rather than asserting that one variable directly causes a change in the other.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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