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What's on the worksheet
- A textile class dyes 30 identical cotton squares.
- A 3D printing lab tests how three settings affect warping in small printed test bars.
- An online plant shop tests versions of its order button.
- A city's bike-share system has 16 docking stations.
- A consumer group tests three brands of paper towel, A, B and C.
- A teacher has 60 students memorize the same 24-line poem.
- A plant nursery roots 36 cuttings of a houseplant.
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Units, treatments, factors and levels: 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