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Lesson Plan

6. Find the line of best fit (FP)

teaches Common Core State Standards A.4C
teaches Common Core State Standards 8.DSP.2
teaches Common Core State Standards CCSS.Math.Content.8.SP.A.2
teaches Common Core State Standards CCSS.Math.Practice.MP5
teaches Common Core State Standards MAFS.8.SP.1.2
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Lesson objective: Determine a line of best fit for a scatter plot by using two points to find the equation of a line.

This lesson helps to build procedural skill with a line of best fit. A scatter plot is used here because it highlights the linear association between the variables. This work develops students' understanding that bivariate data may not have an exact linear association, but a linear model if often used to describe the association.

Students engage in Mathematical Practice 5 (Use appropriate tools strategically) as they use a scatter plot to decide which points best represent the linear association between variables and use those points to find an equation of the line of best fit.

Key vocabulary:

  • bivariate data
  • dependent variable
  • horizontal change
  • independent variable
  • intercept
  • line of best fit
  • linear association
  • linear model
  • negative association
  • patterns of association
  • positive association
  • slope
  • vertical change
  • y-intercept

Special materials needed:

  • uncooked spaghetti noodle or another thin straight edge
Related content

Appears in

Patterns of association in bivariate data

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