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PSYC 201 (12)
Lecture

PSYC 201 NOV. 25.docx

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Department
Psychology
Course
PSYC 201
Professor
Stephen Lindsay
Semester
Fall

Description
Bar Graph: Main effect – with variable one, add both and divide by two to get the mean and compare to other variable. Interaction – analogy for non-parallelism Quiz 1. B (There can be no main effect of A and B but there is an AxB interaction) Example: cross-over interaction (each mean of each variable are equal) 2. C 3. C (Simple effects test is done to analyze data from factorial design that yields a significant interaction) Why believe a claim? -Evidence -Strength of evidence varies -Cannot always do true experiments. Sometimes settle for quasi experiments. -Ex post facto (After the fact) studies are particularly weak (e.g. I use Pantene and my hair is great!) -Adding a control (comparison) condition of some kind can increase internal validity. -Comparison group
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