AP Statistics Full Mock Test 7: Advanced Inference — Chi-Square and Regression
AP Statistics Full Mock Test 7 emphasizes Units 8 and 9: chi-square tests and regression slope inference. Master advanced FRQ procedures and computer output interpretation.
About Full Mock 7
Full Mock 7 places emphasis on Units 8 and 9 — chi-square tests and inference for regression slopes — which are the most advanced inference topics in AP Statistics and appear regularly in the FRQ section of the exam. All 9 units are still covered, but this mock is specifically designed to build depth in these final two units.
Chi-Square Emphasis (Unit 8)
Distinguishing the Three Test Types
Mock 7 includes MCQ and FRQ questions that require students to identify the correct chi-square procedure for a described scenario, then carry it out completely. Questions test the ability to distinguish between goodness-of-fit (one sample, one categorical variable), homogeneity (multiple groups, comparing distributions), and independence (one sample, two categorical variables) — a distinction the AP exam tests both directly and embedded within larger problems.
Expected Count Verification
Multiple questions require students to calculate expected counts from a two-way table and explicitly verify the condition that all expected counts are at least 5. FRQ responses that skip this condition check — even when the test is otherwise correct — do not earn full credit.
Regression Inference Emphasis (Unit 9)
Computer Output Interpretation
Several FRQ questions in Mock 7 are built around regression computer output tables. Students must extract the sample slope, identify its standard error, and use these values to perform a t-test for the population slope or to construct a confidence interval. Questions also ask for the correct degrees of freedom (n − 2) and a fully contextual interpretation of the slope confidence interval.
Connecting Unit 2 and Unit 9
Mock 7 includes FRQ questions that begin with Unit 2 regression description — assessing the LSRL, interpreting r-squared, evaluating a residual plot — before extending to Unit 9 inference. This design reflects the AP exam pattern where regression FRQs often span both descriptive and inferential elements.
Who Should Prioritize Mock 7
Students who are confident in Units 1 through 7 but feel less prepared for chi-square and regression inference should make Mock 7 a priority. These units are sometimes studied quickly at the end of the course, but they appear with meaningful frequency on the AP exam and can be the difference between a 3 and a 4 or between a 4 and a 5.