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What's on the worksheet
- Say whether each study is a sample survey, an observational study or an experiment.
- Sophia trains puppies.
- In a Spanish class, each student chose whether to use a free vocabulary app for a month.
- A researcher wants to answer each question below.
- A science museum has 2,400 members.
- A doctor compares the blood pressure of adults who cycle to work with adults who drive to work.
Teach it first
The free lesson teaches it with worked examples and practice problems.
Observational studies and experiments: the lesson ›More Chapter 3 worksheets: Collecting data: sampling and experiments
- 3.1Observational studies and experiments
- 3.2Stratified random sample
- 3.3Systematic sample
- 3.4Cluster samples and choosing a design
- 3.5Undercoverage and nonresponse
- 3.6Units, treatments, factors and levels
- 3.7Control groups, placebos and blinding
- 3.8Random assignment and confounding
- 3.9Completely randomized design and replication
- 3.10Blocking: randomized block and matched pairs designs