Chapter 10 Understanding Correlation and Regression

Can SAT scores be used to predict college grade point averages? How does the age of a house affect its selling price? Is heart rate affected by the amount of blood cholesterol? How much of an increase in sales results from a specific increase in advertising expenditures?

These questions involve looking at two continuous variables, and investigating whether the variables are related. As one variable increases, does the other variable increase, decrease, or stay the same? Because both variables contain quantitative measurements, comparing groups is not appropriate. This chapter discusses the following topics:

  • summarizing continuous variables using scatter plots and statistics.
  • using correlation ...

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