Lesson objective: Apply patterns of association to scatter plots.

This lesson provides an opportunity for students to apply their knowledge and understanding of patterns of association for scatter plots to a real-life situation. Students are asked to determine if there is an association between the weight of a dog and its lifespan.

Key Concept students will use:

- Patterns of association (clustering, outliers, positive or negative association) may emerge when bivariate data are displayed in a scatterplot (as one increases, the other increase or decreases, linear or nonlinear, etc.).

Skills students will use:

- Identifying independent and dependent variables (Grade 6, Unit 5)
- Graphing points in the first quadrant (Grade 5, Unit 14)
- Identifying the slope of a linear association (Grade 8, Unit 7)

Students engage in Mathematical Practice 5 (Use appropriate tools strategically) as they use a scatter plot to determine if there is an association between the weight of a dog and its lifespan.

**Key vocabulary: **

- bivariate data
- consistent scale
- dependent variable
- independent variable
- negative association
- patterns of association
- positive association
- scale break
- scatter plot
*x*-axis
*y*-axis