Chapter 3: Relationships Between Two Quantitative Variables

In this chapter, you'll learn to:

  • Describe the pattern in a scatterplot, and decide what its shape tells about the relationship between the two variables
  • Find a regression line through the center of a cloud of points to summarize the relationship
  • Use the correlation as a measure of how spread out the points are from this line
  • Use diagnostic tools to check for information the summaries don’t tell them, and decide what to do with that information
  • Make shape-changing transformations to re-express a curved relationship so they can use a line as a summary