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Explain how the principle of converging evidence applies to this research scenario and how it affects the researcher's confidence in evaluating the memory-training technique.
Case context: A psychologist reviews three studies on a new memory-training technique. Study A is a highly controlled laboratory experiment with low ecological validity. Study B is a naturalistic observation in a school with high ecological validity but potential confounding variables. Study C is a survey using self-report questionnaires that may have response bias. All three studies, despite using different designs and having distinct methodological flaws, show that the memory-training technique improves memory performance.
Question: Explain how the principle of converging evidence applies to this research scenario and how it affects the researcher's confidence in evaluating the memory-training technique.
Sample answer: The principle of converging evidence applies because the three studies use different designs (experiment, observation, survey) and have different, non-overlapping methodological flaws (low ecological validity, confounding variables, response bias). Since all three studies point to the same result (improved memory performance), the pattern of flaws does not consistently explain away the findings. Therefore, this pattern supports the conclusion and allows the researcher to confidently evaluate the technique's effectiveness despite the imperfections of each individual study.
Key points:
- Identify that the studies have different designs and distinct methodological flaws.
- State that all three studies point to the same result.
- Explain that because the flaws are different and non-overlapping, they do not systematically undermine the conclusion.
- Conclude that this pattern of converging evidence allows the researcher to confidently support the memory-training technique despite individual study imperfections.
Rubric: The response should identify that the studies have different designs and distinct flaws. It should explain that because these diverse studies point to the same result, the pattern of flaws supports the conclusion. It must state that this allows the researcher to confidently evaluate the theory despite individual study limitations.
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Research Methods in Psychology - 4th American Edition @ KPU
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