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Lecture

NONEXPERIMENTAL METHOD PSYCH 291

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Department
Psychology
Course
PSYCH 291
Professor
Joanne Wood
Semester
Fall

Description
NONEXPERIMENTAL DESIGN 3 requirements for demonstrating causality Do people always look for covariation when they draw causal conclusions? *Example of adoption and fertility Do people always look for covariation when they draw causal conclusions? Do people always look for covariation when they draw causal conclusions? *No. People tend to look at yes/yes cell *“positive test bias” *People tend to “test” hypotheses by focusing on confirmatory evidence Do people always look for covariation when they draw causal conclusions? *No. People tend to look at yes/yes cell *“positive test bias” *People tend to “test” hypotheses by focusing on confirmatory evidence *Lay examples: Correlational studies—how do they test covariation? Steps for the researcher: *Measure the two variables *Compute the correlation Aron et al., 2000 Study 1 - Correlational Correlational studies Steps for the researcher: *Measure the two variables *Compute the correlation Example to show conceptually, how correlations work-- Rank order of participants on Novel/ Rank order of participants On Exciting measure . High scores tend to go with high scores; low scores go with low scores = a positive correlation . This is example of positive correlation In the case of a positive correlation, high scores on one measure are associated with high scores on the other measure; low sco
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