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# Lec09 - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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© 2008 Haipeng Shen 2/7/08 Lecture 9 1 STOR 155 Introductory Statistics Lecture 9: Least-Squares Regression The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL

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© 2008 Haipeng Shen 2/7/08 Lecture 9 2 Review Scatter plot: Association: form, direction, strength Just graphical , not numerical . Correlation: Direction, strength, linear Properties Vertical and Horizontal lines: r=0. Correlation can not tell the exact relationship.
© 2008 Haipeng Shen 2/7/08 Lecture 9 3 Topics Least-Squares Regression Regression Lines Equation and interpretation of the line Prediction using the line Correlation and Regression Coefficient of Determination

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© 2008 Haipeng Shen 2/7/08 Lecture 9 4 Age vs. Mean Height
© 2008 Haipeng Shen 2/7/08 Lecture 9 5 To predict mean height at age 32 months?

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© 2008 Haipeng Shen 2/7/08 Lecture 9 6 Linear Regression Correlation measures the direction and strength of the linear relationship between two quantitative variables A regression line summarizes the relationship between two variables if the form of the relationship is linear.
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Lec09 - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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