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Multiple Choice

A research team hypothesizes that commuting in heavy traffic causes stress. To test this, they design a study measuring the objective duration of participants' daily commutes and their subsequent blood cortisol levels. Based on the psychological definition of stress, what critical methodological component is missing from this study's design, and how does its absence limit the researchers' conclusions?

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Updated 2026-06-07

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Research Methods in Psychology - 4th American Edition @ KPU

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