# Lesson 9

Causal Relationships

### Lesson Narrative

The mathematical purpose of this lesson is to understand that the relationship between variables can be, but is not always, a causal relationship. A causal relationship is one in which a change in one of the variables directly causes a change in the other variable. The work of this lesson connects to previous work because students interpreted the relationship between two variables using the correlation coefficient. The work of this lesson connects to upcoming work because students will analyze bivariate data and draw conclusions from their analysis.

When students determine that there is a causal relationship, they are attending to precision (MP6), because they are refining their language to be more precise. When students analyze the relationship between two variables to determine whether they are causal or not, they are modeling with mathematics (MP4).

### Learning Goals

Teacher Facing

• Describe (orally and in writing) the strength and sign of the relationship between two variables.
• Investigate the relationship between two variables to analyze whether or not the relationship is causal.

### Student Facing

• Let’s get a closer look at related variables.

### Student Facing

• I can look for connections between two variables to analyze whether or not there is a causal relationship.

Building On

Building Towards

### Glossary Entries

• causal relationship

A causal relationship is one in which a change in one of the variables causes a change in the other variable.

### Print Formatted Materials

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