Experimental Designs - Experimental Designs Differential...

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Experimental Designs Differential Mortality: participants drop out of the study: may give the illusion that the IV worked but it is a threat to internal validity Pretest Effects 1. Sensitization 2. Repeated Testing Repeated Testing Repetition of the DV in the pretest and posttest can create o Practice o Fatigue Sensitization Knowledge gained from the pretest can sensitize participants to the treatment or the psychological concepts targeted by the intervention o Participants become more sensitive to changes that would otherwise be ignored If repeated testing has an effect: you will see it in both the control and experimental group. Quasi-Experimental Designs One Group Pretest-Posttest Design History Any uncontrollable event that occurs between the pretest and the posttest & that can influence the posttest measurement Maturation Internal changes in the participants over time Regression Towards the Mean
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