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Complete_Lecture 18 - Correlational_Design

# Complete_Lecture 18 - Correlational_Design - Psych 301W...

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Psych 301W – Lecture 18 Fall 09 - Wede Lecture 18– Correlational Designs Correlational research designs Used to search for and describe relationships among measured variables Terminology Predictor Variable (a.k.a. IV) Outcome Variable (a.k.a. DV) Statistical Analysis Decision Tree (Last Page of Textbook) Organizing the Data Scatterplot Uses a standard coordinate system The horizontal axis indicates the scores on the predictor variable The vertical axis represents the scores on the outcome variable A point is plotted for each individual at the intersection of his or her scores on the two variables Regression line The straight line of “best fit” drawn through the points on a scatterplot Regression Equation Prediction of the dependent variable from knowledge of one or more independent variables Regression Equation bx a Y X X s s r Y Y X Y + = - + = ) ( ˆ An Example How does High School GPA relate to College GPA? Collect 1000 participant’s info

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Complete_Lecture 18 - Correlational_Design - Psych 301W...

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