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Chapter 11: Quasi-Experimental Designs

Chapter 11: Quasi-Experimental DesignsPsychology 2301 Introduction to Research MethodsUniversity of Houston True experimental design !Randomly assign participants to levels of the independent variable!Control for extraneous variables!Measure dependent variable!Differences in dependent measure are due to independent variable (internal validity) Quasi-Experimental design !If no manipulation is performed on the IV, the design is correlational.!If the IV is manipulated, but there is not complete random assignment to conditions, the design is called design !One-group Posttest-only design !One-group Pretest-Posttest design !Nonequivalent control group pretest-posttest design !Interrupted time series design !

!Use pretest to assess equivalence "If there is not group equivalence it is still possible to ascertain the effects of the independent variable through changes in test scores (pretest and posttest) "If IV had an effect, experimental group will exhibit greater change

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