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Case Study

Evaluate the researcher's operational definition and their conclusion about the participant. Justify whether the researcher's classification of the participant is valid based on the comprehensive conceptual definition of neuroticism.

Case context: A clinical psychologist conducts a study on personality traits using the Five Factor Model. They operationalize 'neuroticism' solely by asking participants to self-report their frequency of impulsive decisions. One participant scores high on impulsivity but is otherwise consistently observed by peers and clinicians as calm, even-tempered, and highly secure in their daily life. The researcher classifies this participant as having high neuroticism.

Question: Evaluate the researcher's operational definition and their conclusion about the participant. Justify whether the researcher's classification of the participant is valid based on the comprehensive conceptual definition of neuroticism.

Sample answer: The researcher's operational definition lacks construct validity because it is too narrow. While impulsivity is one facet of neuroticism, the broader conceptual definition represents a tendency toward unstable, negative emotions such as anxiety, anger, sadness, and worry. Concluding the participant has high neuroticism is invalid because the participant is calm, even-tempered, and secure, which are the exact characteristics of a low score on the neuroticism dimension. The researcher should have measured the full range of facets to make a valid classification.

Key points:

  • Evaluates the operational definition as too narrow or lacking construct validity.
  • Notes that impulsivity is only one facet of neuroticism.
  • Identifies that being calm, even-tempered, and secure indicates a low neuroticism score.
  • Justifies that the researcher's classification of the participant is invalid.

Rubric: A full-credit response evaluates the operational definition as deficient or lacking construct validity, identifies that impulsivity is only one facet of a broader construct, and judges the classification as invalid because being calm, even-tempered, and secure explicitly indicate low neuroticism.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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