AP®︎ Statistics (pre-2026) Unit 2: Notes & Study Guide
Prepare for your quiz, test, or the AP exam with a comprehensive review on Unit 2 of AP Statistics (pre-2026) – Exploring Two-Variable Data.
Unit 2: Exploring Two-Variable Data
How to measure relationships between two variables using scatterplots, correlation, and linear regression.
Begin with Topic 2.1: Introducing Statistics: A...To review Unit 2, go through each of the 9 topics below.
Everything you actually need to know for your Unit 2 test, pulled directly from the AP® Statistics (pre-2026) curriculum.
Introducing Statistics: Are Variables Related?
Introducing Statistics: Are Variables Related?
- What It Means for Two Variables to Be Related
- Types of Bivariate Data
- Graphs Used to Detect Association
Representing Two Categorical Variables
Representing Two Categorical Variables
- Two-Way Tables and Joint Relative Frequencies
- Graphs for Two Categorical Variables
- Determining Whether Variables Are Associated
Statistics for Two Categorical Variables
Statistics for Two Categorical Variables
- Two-way tables and what they show
- Marginal relative frequencies
- Conditional relative frequencies
Representing the Relationship Between Two Quantitative Variables
Representing the Relationship Between Two Quantitative Variables
- Bivariate Quantitative Data and Scatterplots
- Explanatory and Response Variables
- How to Describe a Scatterplot
Correlation
Correlation
- What Correlation r Is
- How to Determine Correlation
- How to Interpret r in Context
Linear Regression Models
Linear Regression Models
- What a Linear Regression Model Is
- Interpreting the Slope and Intercept
- How to Calculate a Predicted Value
Residuals
Residuals
- What a Residual Is and What It Tells You
- How to Calculate and Interpret a Residual
- What a Residual Plot Shows
Least Squares Regression
Least Squares Regression
- The Least Squares Regression Line
- The Components of the LSRL
- Estimating the Regression Line from Summary Stats
Notes
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