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Definition of Control group

Babylon English

experimental group used to verify the results of an experiment via comparison to the subject group
Control group Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
Personnel, ships, and craft designated to control the waterborne ship-to-shore movement. (JP 3-02)
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Control group Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Control Group was a technology and design consultancy firm, founded in 2001 in Lower Manhattan, New York City, by Campbell Hyers, Scott Anderson, and Colin O'Donnell.

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In the design of experiments, treatments are applied to experimental units in the treatment group(s). In comparative experiments, members of the complementary group, the control group, receive either no treatment or a standard treatment.

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Control group Definition from Medicine Dictionaries & Glossaries
NCI Dictionary of Cancer Terms
In a clinical trial, the group that does not receive the new treatment being studied. This group is compared to the group that receives the new treatment, to see if the new treatment works. 
A Service of the National Cancer Institute.
A group of animals or humans in a study that are treated the same as the exposed groups but without receiving the specific exposure.
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The Glossary of the American Council on Science and Health
Any group of subjects used as a means of comparison in a scientific study.