2.8 Graphing Bivariate Relationships (Optional)
Teaching Tip
Draw different scatterplots to illustrate the difference between positive and negative correlation.
The claim is often made that the crime rate and the unemployment rate are “highly correlated.” Another popular belief is that smoking and lung cancer are “related.” Some people even believe that the Dow Jones Industrial Average and the lengths of fashionable skirts are “associated.” The words correlated, related, and associated imply a relationship between two variables—in the examples just mentioned, two quantitative variables.
One way to describe the relationship between two quantitative variables—called a bivariate relationship—is to construct a scatterplot. A scatterplot is a two-dimensional ...
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