After teaching a group of students about the various types of epidemiologic research studies that can be done, the instructor determines that the teaching was effective when the students describe a community trial as:

Question

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A community trial is conducted as an experimental study design with large populations. Some of the community receives a treatment, while the other part does not. This is probably the most expensive type of experimental study. It involves a great number of subjects, the support of the governmental forces as well as the population involved, a large number of staff over a long period of time, and the cost of the intervention itself. When a whole community is involved, individuals are not approached to be volunteers. What makes it a community study is that the entire community is part of the study. The health problem is identified prior to the implementation of the study. The introduction of an intervention in one community with no introduction in a similar community forms the study population, and the health problem being studied is then monitored between the two populations. The health problem has to be identified first in this type of study.

After Teaching a Group of Students About the Various Types