Lesson plan

# 7. Interpret the slope and intercept of a line of best fit (FP)

teaches Common Core State Standards CCSS.Math.Content.8.SP.A.2 http://corestandards.org/Math/Content/8/SP/A/2
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5

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Lesson objective: Fluently interpret the slope and intercept of a line of best fit for a scatter plot in the context of the independent and dependent variables.

This lesson helps to build fluency with interpreting the slope and intercept of a line of best fit. A line of best is used here because it highlights the slope and intercept of a linear model. This work develops students' understanding that bivariate data may not have an exact linear association, but a linear model is often used to describe the association.

Students engage in Mathematical Practice 5 (Use appropriate tools strategically) as they interpret the slope and intercept of a line of best fit.

Key vocabulary:

• bivariate data
• dependent variable
• independent variable
• intercept
• line of best fit
• rate of change
• slope
• y-intercept