Epidemiologic studies of the role of a suspected factor in the etiology of a disease may...

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Epidemiologic studies of the role of a suspected factor in the etiology of a disease may be observational or experimental The essential 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 Epidemiologic studies of the role of a suspected factor in the etiology of a disease may be observational or experimental The essential 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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