11 - Research Validity Def Appropriateness of inferences...

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9/26/11 Research Validity Def: Appropriateness of inferences drawn from data A braoder question than measurement validity 4 types o Internal o External o Statistical/Conclusion o Construct Internal Validity The extent to which we can infer that a relationship between 2 variables is casual or that absence of a relationship implies absence of cause j Think – inside the experiment o Is it a sound design Determinants of internal validity Internal consistency/standardization of research design and variables o IV=cause o DV=effect Not: confound = cause Quality of research design: Controlling extraneous and confounding variables External Validity Inference that results can be generalized to and across alternate measures, participants, settings, and times How generalizable are the results? Inverse relationship between internal and external validity Example I measure verbal intelligence by having people perform either SAT problems or
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