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Threats to Internal & External Validity

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?

4 Robert S Michael Internal & External Validity-7 Example: Necessary Conditions for Causality A correlation (aka, relationship) exists between coffee drinking and the likelihood of having a heart attack.

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  Internal, Threats, Between, Relationship, External, Validity, Threats to internal amp external validity

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