L08-09

# L08-09 - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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9/22/09 Lecture 8 1 STOR 155 Introductory Statistics Lecture 8: Least-Squares Regression The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL

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9/22/09 Lecture 8 2 Review • Scatter plot: – Association: form, direction, strength – Just graphical , not numerical • Correlation: – Direction, strength, linear – Properties – Vertical and horizontal lines: r =0. • Correlation cannot tell the exact relationship.
9/22/09 Lecture 8 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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9/22/09 Lecture 8 4 Age vs. Mean Height
9/22/09 Lecture 8 5 To predict mean height at age 32 months?

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9/22/09 Lecture 8 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. – describes how a response variable y changes as an
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## This note was uploaded on 11/17/2011 for the course STOR 155 taught by Professor Andrewb.nobel during the Fall '08 term at UNC.

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L08-09 - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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