3600pp8 - Chapter 8: Experimental Design Confounds...

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Chapter 8: Experimental Design Confounds Extraneous variable changes systematically along with the IV No confounds = internal validity Changes between groups attributed to the manipulation of the IV “True” Experiments Characteristics 1. Presence of a control group 2. Random assignment of participants Post-test Only Designs (randomly assigned to conditions) Participants Experimental Control DV DV Pretest-Post-test Designs Participants (randomly assigned to conditions) Group A Group B Pretest Pretest Treatment No Treatment DV DV Advantages Random assign. = Groups equivalent Pretests allow the selection of certain people Pretests necessary when IV lasts a long period of time (e.g., 1-week)
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Mortality assessment Disadvantages Time consuming A clue for participants Solomon Four-Group Design Pattern of means showing no effect of the pretest. Pattern of means showing an effect of the pretest. Assigning Participants to Groups
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3600pp8 - Chapter 8: Experimental Design Confounds...

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