What is the difference between external and internal validity of research study design? This job gives an example to understand these terms.
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https://brainmass.com/health-sciences/evaluation-measurement-and-research-methods/external-and-internal-validity-103437
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Validity in research study design usually refers to the tools used to measure aspects of the research question, for example a questionnaire is used in survey design and is said to have ‘internal validity’ if the questions …
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