Biology, 16.03.2020 20:42 jordanmjdmary8571
Epidemiologic studies that examine the role of a suspected factor in the etiology of a disease may be observational or experimental. The most important difference between experimental and observational studies is that in experimental studies:
a. The study and control groups are equal in size.
b. The study is prospective.
c. The study and control groups are always comparable with respect to all factors other than the exposure.
d. The investigator determines who shall be exposed to the suspected factor and who shall not.
e. Controls are used.
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Epidemiologic studies that examine the role of a suspected factor in the etiology of a disease may b...
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