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AP Statistics / Unit 1

Unit 1 · 20–30%

Exploring One-Variable Data and Collecting Data

Describe a single variable, then design a study that can actually answer the question.

Start first lessonUnit practice

Topics

  • Categorical and quantitative variables
  • Shape, center, and spread
  • Standard deviation and z-scores
  • Sampling methods and bias
  • Observational studies and experiments

Lessons

Key terms

Original practice

Marlow Works questions. If this unit does not have its own items yet, you will see other questions from the same course.

1 of 1Exploring One-Variable Data and Collecting Data · easy · multiple choice

A reporter stands at one grocery-store exit and asks shoppers whether they support a new park tax. Why is this a poor way to estimate citywide support?

Original Marlow Works item — not a College Board question.

Take your time—this is practice, not a test.

Review checklist

  1. 01Name the variable type before choosing a graph.
  2. 02Report center and spread together.
  3. 03State the sampling or assignment method in one sentence.

Related resources

External links with reuse status. Marlow Works is independent and does not copy restricted exam or textbook material.

  • Official / link only

    AP Statistics course page

    Official revised 2026–27 five-unit framework.

    College Board · All rights reserved · accessed 2026-10-01

    Open source

  • CC BY — attribution required

    Collaborative Statistics

    Open statistics text for distributions, probability, and inference.

    Open Textbook Library listing · CC BY · accessed 2026-10-01

    Open source