📝 Unit Tests

AP Statistics Unit Tests

Pick a unit to drill it head-on. Each unit has 4 different test variations so you can keep retaking until you master it.

15–23% of exam

One- and two-variable data, distributions, summary stats, and graphical displays.

12 questions · ~18 min

Pick a variation

12–15% of exam

Sampling methods, experiments vs observational studies, and bias.

12 questions · ~18 min

Pick a variation

15–25% of exam

Conditional probability, independence, random variables, and the binomial / normal distributions.

12 questions · ~18 min

Pick a variation

12–17% of exam

Constructing and interpreting confidence intervals for proportions and means.

12 questions · ~18 min

Pick a variation

12–17% of exam

Significance tests for proportions, means, and chi-square. Type I/II errors and power.

12 questions · ~18 min

Pick a variation

2–5% of exam

Linear regression, residuals, correlation, and inference for the slope.

12 questions · ~18 min

Pick a variation

How unit tests work

Focused on a single AP unit, between a single-topic quiz and the full diagnostic.
4 variations per unit — pick a fresh variation any time you retake.
Roughly 90 seconds per question — the same pacing as the AP exam.
You'll get a unit-level score, recommended topics to review, and a question-by-question explanation.

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