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AP®︎ Statistics (pre-2026) Study Guides

Prepare for your quiz, test, or the AP exam with comprehensive study guides that cover everything you need to know. Select a unit or topic to begin.

Unit 1: Exploring One-Variable Data

All Topics
Complete Unit Review

Topic 1.1
Introducing Statistics: What Can We Learn from Data?

Topic 1.2
The Language of Variation: Variables

Topic 1.3
Representing a Categorical Variable with Tables

Topic 1.4
Representing a Categorical Variable with Graphs

Topic 1.5
Representing a Quantitative Variable with Graphs

Topic 1.6
Describing the Distribution of a Quantitative Variable

Topic 1.7
Summary Statistics for a Quantitative Variable

Topic 1.8
Graphical Representations of Summary Statistics

Topic 1.9
Comparing Distributions of a Quantitative Variable

Topic 1.10
The Normal Distribution

Unit 2: Exploring Two-Variable Data

All Topics
Complete Unit Review

Topic 2.1
Introducing Statistics: Are Variables Related?

Topic 2.2
Representing Two Categorical Variables

Topic 2.3
Statistics for Two Categorical Variables

Topic 2.4
Representing the Relationship Between Two Quantitative Variables

Topic 2.5
Correlation

Topic 2.6
Linear Regression Models

Topic 2.7
Residuals

Topic 2.8
Least Squares Regression

Topic 2.9
Analyzing Departures from Linearity

Unit 3: Collecting Data

All Topics
Complete Unit Review

Topic 3.1
Introducing Statistics: Do the Data We Collected Tell the Truth?

Topic 3.2
Introduction to Planning a Study

Topic 3.3
Random Sampling and Data Collection

Topic 3.4
Potential Problems with Sampling

Topic 3.5
Introduction to Experimental Design

Topic 3.6
Selecting an Experimental Design

Topic 3.7
Inference and Experiments

Unit 4: Probability, Random Variables, and Probability Distributions

All Topics
Complete Unit Review

Topic 4.1
Introducing Statistics: Random and Non-Random Patterns?

Topic 4.2
Estimating Probabilities Using Simulation

Topic 4.3
Introduction to Probability

Topic 4.4
Mutually Exclusive Events

Topic 4.5
Conditional Probability

Topic 4.6
Independent Events and Unions of Events

Topic 4.7
Introduction to Random Variables and Probability Distributions

Topic 4.8
Mean and Standard Deviation of Random Variables

Topic 4.9
Combining Random Variables

Topic 4.10
Introduction to the Binomial Distribution

Topic 4.11
Parameters for a Binomial Distribution

Topic 4.12
The Geometric Distribution

Unit 5: Sampling Distributions

All Topics
Complete Unit Review

Topic 5.1
Introducing Statistics: Why Is My Sample Not Like Yours?

Topic 5.2
The Normal Distribution, Revisited

Topic 5.3
The Central Limit Theorem

Topic 5.4
Biased and Unbiased Point Estimates

Topic 5.5
Sampling Distributions for Sample Proportions

Topic 5.6
Sampling Distributions for Differences in Sample Proportions

Topic 5.7
Sampling Distributions for Sample Means

Topic 5.8
Sampling Distributions for Differences in Sample Means

Unit 6: Inference for Categorical Data: Proportions

All Topics
Complete Unit Review

Topic 6.1
Introducing Statistics: Why Be Normal?

Topic 6.2
Constructing a Confidence Interval for a Population Proportion

Topic 6.3
Justifying a Claim Based on a Confidence Interval for a Population Proportion

Topic 6.4
Setting Up a Test for a Population Proportion

Topic 6.5
Interpreting p-Values

Topic 6.6
Concluding a Test for a Population Proportion

Topic 6.7
Potential Errors When Performing Tests

Topic 6.8
Confidence Intervals for the Difference of Two Proportions

Topic 6.9
Justifying a Claim Based on a Confidence Interval for a Difference of Population Proportions

Topic 6.10
Setting Up a Test for the Difference of Two Population Proportion

Topic 6.11
Carrying Out a Test for the Difference of Two Population Proportions

Unit 7: Inference for Quantitative Data: Means

All Topics
Complete Unit Review

Topic 7.1
Introducing Statistics: Why Should I Worry About Error?

Topic 7.2
Constructing a Confidence Interval for a Population Mean

Topic 7.3
Justifying a Claim About a Population Mean Based on a Confidence Interval

Topic 7.4
Setting Up a Test for a Population Mean

Topic 7.5
Carrying Out a Test for a Population Mean

Topic 7.6
Confidence Intervals for the Difference of Two Means

Topic 7.7
Justifying a Claim About the Difference of Two Means Based on a Confidence Interval

Topic 7.8
Setting Up a Test for the Difference of Two Population Means

Topic 7.9
Carrying Out a Test for the Difference of Two Population Means

Topic 7.10
Skills Focus: Selecting, Implementing, and Communicating Inference Procedures

Unit 8: Inference for Categorical Data: Chi-Square

All Topics
Complete Unit Review

Topic 8.1
Introducing Statistics: Are My Results Unexpected?

Topic 8.2
Setting Up a Chi-Square Goodness of Fit Test

Topic 8.3
Carrying Out a Chi-Square Test for Goodness of Fit

Topic 8.4
Expected Counts in Two-Way Tables

Topic 8.5
Setting Up a Chi-Square Test for Homogeneity or Independence

Topic 8.6
Carrying Out a Chi-Square Test for Homogeneity or Independence

Topic 8.7
Skills Focus: Selecting an Appropriate Inference Procedure for Categorical Data

Unit 9: Inference for Quantitative Data: Slopes

All Topics
Complete Unit Review

Topic 9.1
Introducing Statistics: Do Those Points Align?

Topic 9.2
Confidence Intervals for the Slope of a Regression Model

Topic 9.3
Justifying a Claim About the Slope of a Regression Model Based on a Confidence Interval

Topic 9.4
Setting Up a Test for the Slope of a Regression Model

Topic 9.5
Carrying Out a Test for the Slope of a Regression Model

Topic 9.6
Skills Focus: Selecting an Appropriate Inference Procedure

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