Short Answer

A clinical trial is designed to test a new therapy theory (AA) by investigating the hypothesis that patients will show a 50% reduction in symptoms (BB). The results show that patients do not experience a 50% reduction in symptoms. Apply the formal logic of hypothesis disconfirmation to express this scenario in logical notation and state the final status of the therapy theory.

Question: A clinical trial is designed to test a new therapy theory (AA) by investigating the hypothesis that patients will show a 50% reduction in symptoms (BB). The results show that patients do not experience a 50% reduction in symptoms. Apply the formal logic of hypothesis disconfirmation to express this scenario in logical notation and state the final status of the therapy theory.

Sample answer: The logic is represented as: if AA then BB; we observe not BB; therefore, we must conclude not AA. Consequently, the therapy theory is incorrect.

Key points:

  • Applies conditional logic representing that the theory implies the hypothesis (if AA then BB).
  • Applies the empirical outcome showing the hypothesis is false (not BB).
  • Applies the final logical conclusion representing that the theory is incorrect (not AA).

Rubric: The answer should apply the logical notation (if AA then BB, not BB, therefore not AA) and state that the theory (AA) is incorrect or disproved.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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