Chapter 7-1 - Chapter 7 Exploring Relationships between...

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1 Chapter 7 Exploring Relationships between Variables Smoking and lung cancer Altitude and boiling point of water Temperature and ozone concentration in air Temperature and heating gas bill Economic conditions and presidential elections
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2 Chapter 7 Scatterplot, Association, Correlation Goal Let X and Y be two quantitative variables. Explore the relationship between X and Y
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3 Chapter 7 Scatterplot, Association, Correlation Some Facts about Scatterplots: X: Explanatory variable----explains or influences changes in the response variable Y: Response variable----measures an outcome of a study
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4 Chapter 7 Scatterplot, Association, Correlation Shapes of Scatterplot Positive association: increasing trend Negative association: decreasing trend
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5 Chapter 7 Scatterplot, Association, Correlation Example: Average-Degree days and Natural Gas Consumption X: Explanatory variable: avg. number of heating degree days each day during the month. Heating degree-days are the usual measure of demand for
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This note was uploaded on 03/27/2012 for the course STT 200 taught by Professor Dikong during the Spring '08 term at Michigan State University.

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Chapter 7-1 - Chapter 7 Exploring Relationships between...

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