Researchers often employ correlational designs to assess the relationship between stress and physical health (e.g., Holmes & Rahe, 1967).One problem with this approach is that researchers using this method

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Correlational designs can only show a relationship between two variables, but they cannot determine which variable causes the other. It is always possible that a third variable could be causing both the stress and physical health outcomes. Therefore, researchers using this approach cannot make definitive causal statements.

Researchers Often Employ Correlational Designs to Assess the Relationship Between