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control - 031:010 Research Methods in Psychology Spring...

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031:010 - Research Methods in Psychology Spring, 2010 April 1 st
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Four Validities ( what? again! ) SCV : the extent to which the inferences made about the sampling population ( using a sample ) are accurate IntVal : the extent to which a significant IV-DV relationship is causal and not spurious ConVal : the extent to which the operational definitions of the independent and dependent variables are accurate which means : the extent to which the measure provides an accurate estimate of ( all and only ) the target theoretical construct and/or the extent to which the manipulation alters ( all and only ) the target theoretical construct ExtVal : the extent to which the findings will generalize to other situations
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Major Threats to Internal Validity Confounds! lack of control all else was not equal Internal Validity - the extent to which a significant IV-DV relationship is causal and not spurious note: the failure to find a significant relationship could be caused by a confound that works against the IV
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Outline Recall: the specific confounds to worry about depend on the type of experimental design Therefore: the key design issues to focus on depend on the type of experimental design Between-subjects: random assignment Within-subjects: counter-balancing
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Choosing the Design Type factors favoring between-subjects - interest in a subject variable ( e.g., trait anxiety ) ( technically, this makes it a quasi-experiment ) - need for a “vanilla” control condition
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