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AP Statistics

5A–5B Exam Practice

Shared by Ashton · Oct 28, 2026 · 0 plays

AP-style questions for the Unit 5 test, covering all of 5A and 5B: reading computer output, residual plots and model fit, interpreting r² and s, correlation, slope, prediction and residuals. 40 questions.

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40 questions across 5 sections. After every answer you’ll see why each choice is right or wrong, not just the one you picked.

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Open a question to see the answer choices and the correct answer.

For 14 midsize SUVs, x = 0-to-60 mph time (seconds) and y = stopping distance from 60 mph (feet). Output: Constant Coef = 107.4, Accel Coef = 2.86, S = 4.2, R-Sq = 31.5%. What is the least-squares regression equation?
  1. A. ŷ = 107.4 + 2.86x ✓
  2. B. ŷ = 2.86 + 107.4x
  3. C. ŷ = 31.5 + 2.86x
  4. D. ŷ = 107.4 + 4.2x

Correct answer: A. Constant is a, and the Accel row's Coef is b.

For 14 midsize SUVs, x = 0-to-60 mph time (seconds) and y = stopping distance from 60 mph (feet). Output: Constant Coef = 107.4, Accel Coef = 2.86, S = 4.2, R-Sq = 31.5%. Which is the correct interpretation of the slope?
  1. A. Each extra second of 0–60 time causes 2.86 ft more stopping distance
  2. B. Predicted 0–60 time rises 2.86 seconds per extra foot of stopping distance
  3. C. Stopping distance rises exactly 2.86 ft per extra second of 0–60 time
  4. D. Predicted stopping distance rises 2.86 ft per extra second of 0–60 time ✓

Correct answer: D. Predicted, amount, per one unit of x, in context.

For 14 midsize SUVs, x = 0-to-60 mph time (seconds) and y = stopping distance from 60 mph (feet). Output: Constant Coef = 107.4, Accel Coef = 2.86, S = 4.2, R-Sq = 31.5%. Which is the correct interpretation of S = 4.2?
  1. A. The SUVs' stopping distances typically differ from their mean by 4.2 ft
  2. B. Predicted stopping distance rises about 4.2 ft per extra second of 0–60 time
  3. C. About 4.2% of the variation in stopping distance is explained by the line
  4. D. Actual stopping distances are typically about 4.2 ft from the predicted ones ✓

Correct answer: D. S is the typical prediction error, in units of y.

For 14 midsize SUVs, x = 0-to-60 mph time (seconds) and y = stopping distance from 60 mph (feet). Output: Constant Coef = 107.4, Accel Coef = 2.86, S = 4.2, R-Sq = 31.5%. What is the correlation r?
  1. A. 0.561 ✓
  2. B. −0.561
  3. C. 0.315
  4. D. 0.099

Correct answer: A. √0.315 ≈ 0.561, positive because the slope is positive.

Hurricane output for y = maximum wind speed (knots) and x = minimum pressure (mb): Constant Coef = 1131.6, Pressure Coef = −1.076, R-Sq = 87.9%. What is r?
  1. A. −1.076
  2. B. −0.938 ✓
  3. C. −0.879
  4. D. 0.938

Correct answer: B. √0.879 ≈ 0.938, negative because the slope is negative.