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You are designing an experiment to test a new conceptual research question and want to ensure high construct validity. Based on the relationship between experimental conditions and construct validity, how should you structure your conditions to isolate your phenomenon of interest while maintaining design efficiency?
Question: You are designing an experiment to test a new conceptual research question and want to ensure high construct validity. Based on the relationship between experimental conditions and construct validity, how should you structure your conditions to isolate your phenomenon of interest while maintaining design efficiency?
Sample answer: To achieve high construct validity, I should structure the experiment with multiple conditions rather than just two, in order to clearly isolate the specific phenomenon of interest from general alternative explanations. However, I should avoid adding an excessive number of conditions, as the gain in construct validity and conceptual insight will eventually plateau.
Key points:
- Structure the experiment with multiple conditions instead of only two to clearly isolate the phenomenon of interest.
- Avoid simple two-condition designs that fail to rule out general alternative explanations.
- Do not add too many conditions, as the construct validity gains eventually plateau.
Rubric: The answer should apply construct validity principles by recommending the use of multiple conditions (more than two) to isolate the specific phenomenon, while cautioning against adding too many conditions because the resulting insight and construct validity gains will eventually plateau.
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Research Methods in Psychology - 4th American Edition @ KPU
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