Introduction: Why Small Errors Cost Big Points
Every year, thousands of AP Statistics students know the content — but lose points because of avoidable mistakes. The exam is as much about precision in communication as it is about calculations.
This guide will help you:
- Identify the most common AP Stats errors.
- Learn how to avoid them with simple strategies.
- Practice smarter using RevisionDojo resources.
If you can avoid these traps, you’ll raise your score by 5–10 raw points — often the difference between a 3 and a 5.
Error #1: Misinterpreting p-Values
The Mistake
- Writing: “The p-value is the probability that the null hypothesis is true.”
- Or: “Accept H₀.”
The Fix
- Correct: “The p-value is the probability of obtaining results as extreme or more extreme, assuming H₀ is true.”
- Say: “Fail to reject H₀,” not “accept.”
Error #2: Confusing Stratified vs Cluster Sampling
The Mistake
- Calling a cluster sample “stratified” (or vice versa).
The Fix
- Stratified = Subgroups represented.
- Cluster = Clumps chosen.
Error #3: Forgetting Context in FRQs
The Mistake
- Writing: “Reject H₀ at α = 0.05.”
