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(Choose 1 answer)
☐ A
A. Retrospective
☐ C
B. Observational study
C. An experiment.
In an attempt to study the health effects of air pollution, a group of researchs selected 6 cities in very different
environments some from an urban setting (e.g. greater Boston), some from a heavy industrial setting (e.g.
eastern Ohio), some from a rural setting (e.g. Wisconsin). Altogether they selected 8000 subjects from the 6
cities, and followed their health for the next 20 years.
This represents what type of study?
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D. None of them.
FUO.sh
sh the exam.
