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# Study design

AP Stats: DAT (BI), DAT‑1 (EU), DAT‑2 (EU), VAR (BI), VAR‑1 (EU), VAR‑3 (EU)

AP Stats: DAT (BI), DAT‑2 (EU), DAT‑2.A (LO), DAT‑2.A.1 (EK), DAT‑2.A.2 (EK), DAT‑2.B (LO), DAT‑2.B.1 (EK), DAT‑2.B.2 (EK), DAT‑2.E (LO), DAT‑2.E.1 (EK), DAT‑2.E.2 (EK), DAT‑2.E.3 (EK), DAT‑2.E.4 (EK), DAT‑2.E.5 (EK), DAT‑2.E.6 (EK), VAR (BI), VAR‑1 (EU), VAR‑1.E (LO), VAR‑1.E.1 (EK)

Learn

Identifying a sample and populationGeneralizabilty of survey results exampleExamples of bias in surveysExample of undercoverage introducing biasIdentifying bias in samples and surveys

Practice

Identifying the population and sampleGet 3 of 4 questions to level up!

Generalizability of resultsGet 5 of 7 questions to level up!

Bias in samples and surveysGet 5 of 7 questions to level up!

AP Stats: DAT (BI), DAT‑2 (EU), DAT‑2.C (LO), DAT‑2.C.1 (EK), DAT‑2.C.2 (EK), DAT‑2.C.3 (EK), DAT‑2.C.4 (EK)

Learn

Techniques for generating a simple random sampleTechniques for random sampling and avoiding bias

Practice

Simple random samplesGet 3 of 4 questions to level up!

Sampling methodsGet 5 of 7 questions to level up!

AP Stats: DAT (BI), DAT‑1 (EU), DAT‑1.C (LO), DAT‑1.C.2 (EK), DAT‑2 (EU), DAT‑2.A (LO), DAT‑2.A.3 (EK), DAT‑2.A.4 (EK), DAT‑2.B (LO), DAT‑2.B.3 (EK)

Learn

Types of statistical studiesWorked example identifying experimentWorked example identifying observational studyObservational studies and experiments

Practice

Observational studies versus experimentsGet 5 of 7 questions to level up!

Learn

Introduction to experiment designThe language of experimentsPrinciples of experiment designRandom sampling vs. random assignment (scope of inference)Matched pairs experiment designInvalid conclusions from studies exampleCan causality be established from this study?

Practice

Experiment designsGet 3 of 4 questions to level up!

Finding errors in study conclusionsGet 3 of 4 questions to level up!

Experiment design considerationsGet 3 of 4 questions to level up!

### About this unit

Statistics is all about forming questions and gathering data to explore those questions. This unit covers sampling and survey methods, observational studies, and basic experiment design.AP® is a registered trademark of the College Board, which has not reviewed this resource.