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Unformatted text preview: group or control group (may have a placebo group as well) Pretest/Posttest Design pretest/treatment/posttest, involves random assignment to experimental group or control group (may have a placebo group as well) Solomon 4 group Design-look to book (his example is somewhat nonsensical) Internal Validity-are you really getting the effect of the independent variable? Or some other factor? Threats-selection-failure of random assignment History external events Maturation Testing-need to watch out for pre-test sensitization (they get better on post cuz theyve taken test already) External Validity-does the info you gain apply or generalize...
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This note was uploaded on 04/27/2008 for the course PSYC 320 taught by Professor Rideout during the Spring '08 term at Ursinus.
- Spring '08