UT Knoxville STAT 201 - Chapter 7 (30 pages)

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Chapter 7



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Chapter 7

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Pages:
30
School:
University of Tennessee
Course:
Stat 201 - Introduction to Statistics
Introduction to Statistics Documents

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Chapter 7 Chapter07 Presentation 1213 Scatterplots Association and Correlation Copyright 2009 Pearson Education Inc 1 Univariate vs Bivariate Data What do we mean by univariate data Are timeplots graphical displays of univariate data What is a Scatterplot Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc 2 Things to Look For in Scatterplots Direction Form Strength Unusual features Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc 3 Direction Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc Positive negative or neither 4 Form Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc Approximately a straight line or something else 5 Form cont y So what if the relationship is not linear x y x Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc 6 Strength Examples of strong relationships x Chapter07 Presentation 1213 y y y Copyright 2009 Pearson Education Inc x x 7 Strength cont Example of a weak relationship y x Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc 8 Unusual Features Outliers Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc How would you describe this person 9 Unusual Features Clusters or Subgroups x thickness in thousandths of an inch of glue applied to one of two surfaces y the strength of the bond between the two surfaces higher values mean stronger bond Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc 10 Unusual Features Clusters or Subgroups Cont Dots are Supplier A and plus signs are Supplier B What is your conclusion Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc 11 Measuring the Strength of a Linear Relationship The correlation coefficient r Formula from your textbook r z z xy Other formulas r n 1 x x y y x x y y i i 2 i 2 i Typically software is used to calculate r Chapter07 Presentation 1213 Copyright 2009 Pearson Education Inc 12 Correlation Example Data collected from students in college class included their heights



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