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When evaluating the methodological rigor of a proposed pain-tolerance study, a peer reviewer notices that the sex of the experimenters is not standardized across participant groups. According to the empirical evidence from Ibolya, Brake, and Voss (2004), the reviewer should judge this design as critically flawed because the experimenter's sex acts as an uncontrolled ________ variable, which introduces systematic bias and threatens the study's internal validity.

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Updated 2026-06-07

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Research Methods in Psychology - 4th American Edition @ KPU

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