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Criterion validity involves evaluating how effectively a measure aligns with expectations by correlating it with other relevant variables. Researchers assess this by analyzing the correlations among multiple measures of the same psychological construct, or by verifying expected relationships with measures of conceptually distinct constructs. Additionally, a successful experimental manipulation inherently provides evidence for criterion validity. For example, if an experiment manipulates participants' moods by instructing them to think positive versus negative thoughts, and the subsequent mood measure reveals a distinct difference between the two groups, this simultaneously demonstrates that the manipulation worked and that the measurement tool was valid.

Criterion Validity

In a study by MacDonald and Martineau, researchers manipulated participants' moods by instructing them to think either positive or negative thoughts. A subsequent mood measure revealed a distinct difference in scores between the two groups. This successful experimental manipulation demonstrated both that the mood manipulation worked and that the mood measure possessed criterion validity.

MacDonald and Martineau Mood Manipulation

In psychological research, how is criterion validity primarily evaluated?

A researcher develops a new self-report measure of stress. In an experiment, one group of participants is asked to perform a difficult mental arithmetic task under time pressure (stress-induction condition), while a control group sits quietly. If the stress-induction group scores significantly higher on the new measure than the control group, this experimental outcome serves as evidence that the new stress measure is valid.

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