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Case Study

Evaluate the psychologist's handling of the study outcomes. Diagnose the specific cognitive tendency demonstrated in his actions, justify why this behavior constitutes a threat to scientific inquiry based on the provided definition of this tendency, and decide what corrective actions he should take to ensure a valid scientific conclusion.

Case context: A psychologist is evaluating the efficacy of a new cognitive-behavioral intervention for public speaking anxiety. During the study, he records detailed progress notes for the four participants who reported significant anxiety reduction, highlighting their success. However, he does not document or analyze the records of two participants who dropped out because their anxiety worsened, attributing their outcome to personal issues unrelated to the study.

Question: Evaluate the psychologist's handling of the study outcomes. Diagnose the specific cognitive tendency demonstrated in his actions, justify why this behavior constitutes a threat to scientific inquiry based on the provided definition of this tendency, and decide what corrective actions he should take to ensure a valid scientific conclusion.

Sample answer: The psychologist is demonstrating confirmation bias by selectively focusing on the four successful cases that validate his pre-existing belief in the intervention's efficacy, while actively disregarding the two contradicting cases where participants' anxiety worsened. This behavior threatens scientific inquiry because ignoring disconfirming evidence leads to reinforcing incorrect assumptions about the intervention's success. To correct this, he must systematically document and analyze all participant outcomes, including those that contradict his hypothesis.

Key points:

  • Diagnosis of confirmation bias based on selective focus on validating cases and disregard of contradicting cases.
  • Justification that ignoring contradicting data reinforces incorrect assumptions about the intervention's efficacy.
  • Decision to implement systematic documentation and analysis of all participant outcomes to maintain scientific objectivity.

Rubric: The evaluation must correctly identify confirmation bias, justify the threat by explaining how ignoring disconfirming evidence leads to reinforcing incorrect assumptions, and propose corrective actions like systematically recording and analyzing all participant data.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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