Voters have recently decided to have fluoride added to the city water system. Epidemiologists wanting to study the effect of fluoride on dental caries would be conducting a:
A) Ecologic study
B) Double-blind study
C) Community trial
D) Screening

Question

Quizplus · Accepted Answer

A community trial involves studying the effects of an intervention, like adding fluoride to a city's water supply, on a community or group rather than individuals.

Voters Have Recently Decided to Have Fluoride Added to the City