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External and Internal Validity
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2.5 Internal validity threats - participants | Quantitative methods | The Scientific Method | UvA
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Internal Validity of Research Methods in Social & Behavioral Sciences
2.7 Internal validity threats - artificiality | Quantitative methods | The Scientific Method | UvA
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2.3 Criteria: validity and reliability | Quantitative methods | The Scientific Method | UvA
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What is external validity?
2.6 Internal validity threats - instruments | Quantitative methods | The Scientific Method | UvA
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