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2-22-11 - External Validity Generalizing Your Experiment to...

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2-22-11 External Validity: Generalizing Your Experiment to the Outside External validity – do your results generalize or apply to populations and situations that are different from the experiment o Population generalization – results should apply to people outside the sample in the experiment o Environmental generalization – results should apply to situations different from the one in the experiment o Temporal generalization – results should apply to different times than original experiment was conducted Threats to External Validity (Methods) Interaction of Testing and Treatment – the pretest cues the participant to the treatment and they respond differently than they would have if they didn’t have a pretest Interaction of Selection and Treatment – occurs when the results are only true of you participants and not to larger population Reactive Arrangements – the artificial conditions of the experiment make it difficult to generalize to the real world
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