AP®︎ Statistics (pre-2026) Unit 3: Notes & Study Guide
Prepare for your quiz, test, or the AP exam with a comprehensive review on Unit 3 of AP Statistics (pre-2026) – Collecting Data.
Unit 3: Collecting Data
How experiments and surveys are designed, why randomization matters, and what conclusions you can draw from each.
Begin with Topic 3.1: Introducing Statistics: D...To review Unit 3, go through each of the 7 topics below.
Everything you actually need to know for your Unit 3 test, pulled directly from the AP® Statistics (pre-2026) curriculum.
Introducing Statistics: Do the Data We Collected Tell the Truth?
Introducing Statistics: Do the Data We Collected Tell the Truth?
- When Data Tell the Truth
- Random Sampling and Random Assignment
- Methods That Do Not Rely on Chance
Introduction to Planning a Study
Introduction to Planning a Study
- Population, Sample, and Census
- Types of Studies
- What You Can and Cannot Conclude
Random Sampling and Data Collection
Random Sampling and Data Collection
- Why Random Sampling Matters
- Types of Random Sampling Methods
- Choosing the Right Method
Potential Problems with Sampling
Potential Problems with Sampling
- What Bias in Sampling Is
- Major Sources of Bias in Sampling
- Random vs Non-Random Sampling
Introduction to Experimental Design
Introduction to Experimental Design
- How Experiments Establish Causation
- Principles of a Well-Designed Experiment
- Control Groups, Placebos, and Blinding
Selecting an Experimental Design
Selecting an Experimental Design
- What an Experimental Design Does
- Completely Randomized Design (CRD)
- Randomized Block Design
Inference and Experiments
Inference and Experiments
- Statistical Inference in Experiments
- Why Random Assignment Allows Cause and Effect
- Generalizing Results to a Larger Population
Notes
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