AP®︎ Statistics (pre-2026) Unit 9: Notes & Study Guide
Prepare for your quiz, test, or the AP exam with a comprehensive review on Unit 9 of AP Statistics (pre-2026) – Inference for Quantitative Data: Slopes.
Unit 9: Inference for Quantitative Data: Slopes
How to do inference on the slope of a regression line, including confidence intervals and t-tests.
Begin with Topic 9.1: Introducing Statistics: D...To review Unit 9, go through each of the 6 topics below.
Everything you actually need to know for your Unit 9 test, pulled directly from the AP® Statistics (pre-2026) curriculum.
Introducing Statistics: Do Those Points Align?
Introducing Statistics: Do Those Points Align?
- How Points Align Around a Line
- Random Error vs Systematic Error
- Questions to Ask When Looking at a Scatterplot
Confidence Intervals for the Slope of a Regression Model
Confidence Intervals for the Slope of a Regression Model
- What the slope of a regression model represents
- Conditions for a confidence interval for the slope
- Constructing the confidence interval for the slope
Justifying a Claim About the Slope of a Regression Model Based on a Confidence Interval
Justifying a Claim About the Slope of a Regression Model Based on a Confidence Interval
- What a confidence interval for the slope means
- Using the interval to justify a claim
- How this connects to hypothesis testing
Setting Up a Test for the Slope of a Regression Model
Setting Up a Test for the Slope of a Regression Model
- What a t-test for the slope is actually testing
- Writing hypotheses correctly
- Conditions for inference
Carrying Out a Test for the Slope of a Regression Model
Carrying Out a Test for the Slope of a Regression Model
- The Slope Test in Linear Regression
- Conditions and the Null Distribution of the Slope
- Calculating the Test Statistic and p-Value
Skills Focus: Selecting an Appropriate Inference Procedure
Skills Focus: Selecting an Appropriate Inference Procedure
- The Big Picture Decision
- One-Sample Procedures
- Two-Sample Procedures
Notes
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