Transcription of Threats to Internal & External Validity
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1 Robert S MichaelInternal & External Validity -1 Threats to Internal & External ValidityY520 Strategies for Educational InquiryRobert S MichaelRobert S MichaelInternal & External Validity -2 Why Use Experimental Designs?Man prefers to believe what he prefersto be true. Francis Bacon2 Robert S MichaelInternal & External Validity -3 Threats to Internal & External Validity Is the investigator s conclusion correct? Are the changes in the independent variable indeedresponsible for the observed variation in thedependent variable? Might the variation in the dependent variable beattributable to other causes?Robert S MichaelInternal & External Validity -4 Why is Internal Validity Important? We often conduct research in order to determinecause-and-effect relationships. Can we conclude that changes in the independentvariable caused the observed changes in thedependent variable?
2 Robert S Michael Internal & External Validity-3 Threats to Internal & External Validity Is the investigator’s conclusion correct? Are the changes in the independent variable indeed responsible for the observed variation in the dependent variable? Might the variation in the dependent variable be attributable to other causes?
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Reliability, Validity, Introduction, Introduction Validity, SUBJECT: Validity of AHA eCards, American Heart Association, Reliability and Validity of the, Reliability, Validity, and Utility of, Reliability, Validity, and Utility of Criminal Profiling Typologies, Test has Validity, Reliability, Fairness, and Legal Defensibility