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Explain how the concept of converging evidence is affected when a body of research consists of multiple studies that all share a similar methodological weakness, such as relying entirely on correlational designs.
Question: Explain how the concept of converging evidence is affected when a body of research consists of multiple studies that all share a similar methodological weakness, such as relying entirely on correlational designs.
Sample answer: When multiple studies supporting the same conclusion all share similar methodological weaknesses, it undermines confidence in that conclusion. Although the outcomes are consistent across the studies, this consistency may not reflect a genuine effect. Instead, it could simply be an artifact of their shared vulnerability, such as the third-variable problem in correlational research.
Key points:
- Shared methodological weaknesses across multiple studies undermine confidence in the research conclusion.
- Consistency in outcomes may be an artifact of the shared flaw rather than a genuine effect.
- Relying entirely on a single design type (like correlational studies) introduces shared vulnerabilities such as the third-variable problem.
Rubric: An excellent response must explain that shared methodological flaws across studies weaken confidence in a conclusion because the consistent outcomes could be an artifact of the shared flaw rather than a true effect. It should specifically mention that this undermines the strength of converging evidence and illustrate this using a relevant example of a shared vulnerability (like the third-variable problem or directionality problem).
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Research Methods in Psychology - 4th American Edition @ KPU
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