Chapter 8 - Chapter 8 Experimental Research Design 1...

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Chapter 8: Experimental Research Design 1. Research Design- outline, plan, or strategy used to investigate the research problem a. Best explanation for cause and effect 2. Weak Experimental Designs a. Designs that do not control for many extraneous variables and provide weak evidence of cause and effect b. One-Group Posttest-Only Design b.i. Administration of a posttest to a single group of participants after they have been given an experimental treatment condition b.ii. Rarely useful because the design allows no evidence of what the participants would have scored on the DVs had they not received the treatment b.ii.1. Doesn’t have a no-treatment control group or pretest c. One-Group Pretest-Posttest Design c.i. Design in which a treatment condition is interjected between a pretest and posttest of the DV c.ii. Difference between the pretest and posttest scores is taken as an indication of the effectiveness of the treatment condition d. Posttest-only Design with nonequivalent groups d.i. Performance of an experimental group is compared with that of a nonequivalent control group at the posttest d.ii. Problem- participants in the comparison group might differ in important ways from the participants in the experimental group 3. Strong Experimental Designs a. Have greater internal validity
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Chapter 8 - Chapter 8 Experimental Research Design 1...

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