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Case Study

Based on the Five Factor Model's definition of extroversion, explain why the colleague is correct in stating that counting the number of times a participant speaks is an insufficient operationalization of the extroversion construct.

Case context: A psychology researcher wants to study social behavior and decides to measure extroversion using the Five Factor Model. They design an observational study where they count the number of times a participant speaks during a 10-minute group discussion. They state that this count will serve as their sole measure of extroversion. However, a colleague argues that this operational definition fails to capture the full scope of extroversion as defined in the Five Factor Model.

Question: Based on the Five Factor Model's definition of extroversion, explain why the colleague is correct in stating that counting the number of times a participant speaks is an insufficient operationalization of the extroversion construct.

Sample answer: The colleague is correct because the Five Factor Model defines extroversion as a broad dimension characterized by sociability, assertiveness, and emotional expression. Counting the number of times someone speaks may capture aspects of sociability or assertiveness, but it fails to measure emotional expression or other characteristics of high score individuals (such as warmth and adventure-seeking) and low score individuals (such as being quiet, reserved, and withdrawn). Therefore, using a single vocal count lacks construct validity as it is too narrow for this multi-faceted trait.

Key points:

  • Extroversion is characterized by sociability, assertiveness, and emotional expression.
  • A single vocal count is too narrow and fails to capture all these facets of the construct.
  • The operationalization fails to measure aspects like emotional expression or being reserved/withdrawn.

Rubric: The student's answer must explain that extroversion is a multi-dimensional construct in the Five Factor Model, identifying its three characteristics: sociability, assertiveness, and emotional expression. They must explain that the vocal count only addresses a small subset of these characteristics (e.g., sociability) and neglects others, such as emotional expression.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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