Psyc 2017 CH10

Psyc 2017 CH10 - Chapter10:Experimental ResearchDesign...

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Chapter 10: Experimental Research Design
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Research Design The structure of research. Purpose Control for unwanted variation Design Statistics Conclusions
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Designs with Threats to Internal Validity One-Group Posttest-Only Design No pretest or control group Group 1 Treatment IV Response DV
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One-Group Posttest-Only Design One-Group Pretest-Posttest Design Pretest can be compared to posttest Designs with Threats to Internal Validity Group 1 Treatment IV Posttest Response DV Pretest Response DV
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One-Group Posttest-Only Design One-Group Pretest-Posttest Design Nonequivalent Posttest-Only Design Includes a control group but no random assignment Designs with Threats to Internal Validity Group 1 Treatment IV Posttest Response DV Group 2
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Requirements of Experimental Research Designs Answer the research question or test the hypothesis Control for the effect of extraneous variables Randomization Control group Should allow generalizability of the results
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Pretesting Participants To increase sensitivity through matching To test for ceiling or floor effects
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Floor and Ceiling effects 0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15 No interest Definitely try to meet Un Attractive Very Romantic Interest
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Floor and Ceiling effects -10 -8 –6 –4 –2 0 2 4 6 8 10 Definitely avoid Definitely this person try to meet Un Attractive Very Romantic Interest
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Pretesting Participants To increase sensitivity through matching To test for ceiling or floor effects To test for initial position To insure initial comparability To obtain evidence of change
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Experimental Research Designs Posttest-Only Design Represents basic components of most designs Group 1 Treatment IV Posttest Response DV Group 2
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Types of Posttest-Only Designs Between-participants Within-participants Group 1 Treatment IV - level 1 Posttest Response DV
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Psyc 2017 CH10 - Chapter10:Experimental ResearchDesign...

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