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What is a control group?

What is a control group? Here are some definitions.

Noun
  1. (experiment) The group of test subjects left untreated or unexposed to some procedure and then compared with treated subjects in order to validate the results of the test.
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Examples
Researchers tested their SARS vaccine on four African green monkeys, with another four in the control group.
Dr Duncan found that only one of the groups, the third group, showed any apparent effect in comparison with the control group.
A further 932 were recruited from the public to act as a control group for comparison.
The control group was maintained in a similar chamber ventilated with filtered air.
Direct evaluation cannot be done because very few ganzfeld studies have included a control group.
The possibly calming effect of having family present for the control group during the intervention could have played a part in the reaction.

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