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12_Ch15_Correlation_Outline

# 12_Ch15_Correlation_Outline - 1 2 3 4 5 6 7 8 9 10 11 12...

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Describing Relationships Correlation You should be able to . . . • Describe relationships using correlation • Define and identify: –Positive correlations –Negative correlations –Zero correlations • Construct and interpret scatterplots • Compute and interpret the Pearson Product-Moment Correlation Coefficient Correlation • The degree of relationship between two or more variables • The co-relationship between variables Example • Is there a relationship between height and salary? • Do taller people tend to make more money? • Do taller people tend to make less money? • Is there any relationship at all? Height and Salary Three types of relationships • Positive • Negative • None Positive correlation • A high score on one variable is associated with a high score on the other variable • Likewise, a low score is associated with a low score • There is a direct relationship between the variables Negative correlation • A high score on one variable is associated with a low score on the other variable and vice versa Zero correlation • There is no relationship • It is equally likely that a high score will be associated with a high or low score Displaying correlations: Scatterplot 1 2 3 4 5 6 7 8 9

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