The mathematical purpose of this lesson is for students to interpret the correlation coefficient and to use it to understand the strength of a linear relationship. The term correlation coefficient is introduced and is defined as a number that can be used to determine how well a line models the data.

When students sort scatter plots, they are given the opportunity to analyze representations, statements, and structures closely and make connections (MP2, MP7). When students take turns with a partner to match the correlation coefficients with scatter plots, students trade roles explaining their thinking and listening, which provides opportunities for them to explain their reasoning and critique the reasoning of others (MP3).