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What's on the worksheet
- For each made-up study, name the control group and say whether it receives no treatment, a placebo or the usual treatment.
- A shoe company tests a made-up gel insole on 120 mail carriers, 40 in each of three groups chosen by chance:
- A pet store tests a made-up calming collar that gives off a scent meant to soothe dogs.
- A paint maker tests a made-up additive meant to make house paint dry faster.
- A school tests whether a peppermint scent helps students on a timed 30-question arithmetic test.
- A made-up food company tests a dough conditioner meant to keep bread soft for longer.
- A public library advertises a made-up reading app:
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Control groups, placebos and blinding: 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