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MacDonald and Martineau Mood Manipulation
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.
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Research Methods in Psychology - 4th American Edition @ KPU
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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.