AP Statistics: 9 units covered
Unit 1: Exploring One-Variable Data
15–23% of exam scoreDisplays of categorical and quantitative data, measures of centre and spread, outliers, comparing distributions and the normal distribution.
What it covers (4)- Graphs of one-variable data
- Centre, spread and outliers
- Comparing distributions
- Normal distributions and z-scores
Key formulaStudy Unit 1: Exploring One-Variable DataUnit 2: Exploring Two-Variable Data
5–7% of exam scoreTwo-way tables, scatterplots, correlation, least-squares regression lines and residuals.
Unit 3: Collecting Data
12–15% of exam scoreSampling methods and their bias, observational studies against experiments, and the design of experiments.
Unit 4: Probability, Random Variables, and Probability Distributions
10–20% of exam scoreProbability rules, conditional probability and independence, random variables, and binomial and geometric distributions.
Unit 5: Sampling Distributions
7–12% of exam scoreSampling distributions of a proportion and of a mean, the central limit theorem, and bias and variability of estimators.
Unit 6: Inference for Categorical Data: Proportions
12–15% of exam scoreConfidence intervals and significance tests for one proportion and for the difference of two proportions, and the two types of error.
Unit 7: Inference for Quantitative Data: Means
10–18% of exam scoreThe t-distribution, confidence intervals and tests for one mean, paired data and the difference of two means.
Unit 8: Inference for Categorical Data: Chi-Square
2–5% of exam scoreChi-square tests for goodness of fit, homogeneity and independence.
Unit 9: Inference for Quantitative Data: Slopes
2–5% of exam scoreConfidence intervals and significance tests for the slope of a population regression line.