Calculating the Coefficient of Determination (Validity Varia…
Calculating the Coefficient of Determination (Validity Variance)A researcher develops a “Mechanical Reasoning” test to predict success in a technical training program. The correlation between the test scores and the final exam scores (the criterion) is r = .50. Problem: Calculate the Coefficient of Determination (r²) for this validity coefficient. Application: What percentage of the variance in training success is explained by the test scores, and what percentage remains unexplained?
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A psychologist is using a computer-based scoring system for a depression inventory. The computer generates a report suggesting “High Suicide Risk,” but the psychologist’s clinical interview suggests the patient is actually stable. The psychologist should:
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