Question 1
A test of whether more than half of a college's students support a later start time gives a p-value of 0.18 at α = 0.05. Which conclusion is correct?
AP Statistics free-response questions: how they are scored
Each of the four questions is worth 10 points, and each point is earned on its own. Context, conditions and a clear conclusion win points; long answers do not.
| Questions | 4, about 22 minutes each |
|---|---|
| Points | 10 per question, 40 in all, half the exam |
| Answers | Typed on screen |
What wins points
- Naming the parameter in context: the proportion of all city households, not just p.
- Showing each condition with numbers: 400(0.30) = 120 ≥ 10.
- Finishing with a conclusion about the population, not the sample.
- Answering every part: later parts can earn points even if an earlier one was wrong.
What loses points
- Saying "accept H₀" or that a large p-value proves anything.
- Interpreting a confidence level as a probability for one interval.
- Claiming cause from an observational study.
- Leaving out units or context in an interpretation.
Try 2 questions
Question 2
A company randomly selected 400 of its 9,000 customers and randomly assigned 200 to receive a reminder email and 200 to receive none. More customers who got the email renewed. To whom does a cause-and-effect conclusion apply?
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Questions people ask
How many free-response questions are on AP Statistics?
Four from 2027: one on formulating questions and collecting data, one on analyzing data, one on inference, and one combining several areas.
How is each free-response question scored?
Out of 10 points, each earned independently against its own scoring point.