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Lecture

PSYCH 291 TRUE EXPERIMENTS

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Department
Psychology
Course
PSYCH 291
Professor
Joanne Wood
Semester
Fall

Description
True Experiments Possible threats to internal validity OGPTPT DESIGN *Is selection ruled out as threat to internal validity? Is ambiguity about causal direction ruled out as threat to internal validity? *Is local history ruled out as threat to internal validity? History vs. local history *History—some external event other than the X *Local history—some external event other than the X (or not X) that occurs in one group and not the other *So, by definition, history is some external event that occurs to most people in the sample *Local history is something that occurs to one group of people in sample “typical” correlational design *Is selection a threat to internal validity? *E.g., could people who are higher in novel, exciting activities differ from people who are lower in novel, exciting activities on some other preexisting characteristic that may explain the result? *Is ambiguity about causal direction a threat to internal validity? *Is local history a threat to internal validity? E.g., Could some external event have occurred for those higher in novel, exciting activities but not those lower in novel, exciting activities, or vice versa? What’s so great about true experiments? To illustrate how true expts rule out threats to internal validity *Use example from research by Aron et al. *Experimental study *2 imaginary studies involving same two variables *One-group pretest-posttest design *Threats to internal validity *Would a true expt would rule out these threats? *Static group design *Threats to internal validity *Would a true expt would rule out these threats? Aron et al., 2000 Study 3 - Experimental Various patterns of results one could obtain in this true expt *“ideal” results: Hypothesis confirmed *Bad Results 1: Hypothesis disconfirmed *Bad Results 2: Hypothesis disconfirmed *Various patterns of results one could obtain in a true expt *“ideal” re
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