Ch07

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Unformatted text preview: STAT 2023 - Holbrook Scatterplots, Association, and Correlation Chapter 7 7-1 Scatterplot STAT 2023 - Holbrook 1. Plot of All (Xi, Yi) Pairs 2. Suggests How Well Model Will Fit 60 40 20 0 Y 0 7-2 20 40 X 60 Scatterplot Example STAT 2023 - Holbrook You’re a marketing analyst for Hasbro You’re Toys. You gather the following data: Toys. Ad $ Sales (Units) 1 1 2 1 3 2 4 2 5 4 Plot the data on a Plot scatterplot. scatterplot. 7-3 Scatterplot Sales vs. Advertising STAT 2023 - Holbrook Sales 4 3 2 1 0 0 1 2 3 Advertising 7-4 4 5 X and Y Variables STAT 2023 - Holbrook 1. X Variable Explanatory, Predictor or Independent Explanatory, Variable Variable May be numerical or categorical May May have more than one 2. Y Variable Response or Dependent Variable 7-5 What Is to Be Predicted Numerical STAT 2023 - Holbrook The Correlation Coefficient 7-6 Correlation Coefficient STAT 2023 - Holbrook 1. Measures the Strength and Direction of Measures the Linear Relationship Between the Predictor and Response Variables Predictor 2. Sample Correlation Co...
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This note was uploaded on 12/07/2011 for the course STA 2023 taught by Professor Staff during the Fall '11 term at Santa Fe College.

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