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It's not control arm, just control, meaning a control set or group.

The control group are individuals that are not given the treatment. If this control group are conscious and can apprehend, every effort is made to make them think they are getting the treatment though they aren't.

The reason for the control group is to be able to compare the individuals who have had the treatment (called the experimental group) with others that are in all ways the same except for the treatment and thus see/measure what difference the treatment makes.

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11y ago

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