A control group—a population of gorillas unaffected by Ebola, separated by a river and 20 kilometers—was also observed.
The control group proved able to respond two to two and a half times faster than usual and with poor aim.
For one thing, you'd probably have trouble getting people to stay in the control group once you put them there.
Binik cautions that it's difficult to assess the reliability of studies like this because they do not contain a control group.
About 5% of the control group, or 300 people, reported having "catastrophic" medical expenses of more than 30% of their income.
The test group shows no gain over the control group in strength of grip.
There is no control group, and consequently, no way of knowing whether the improvement was due to the removal of the defect.
The test group contains eight cases which made a poorer score at the end of the interval, the control group six.
As a control group, there were chosen 45 boys who had had no operation, and who lived and worked under the same conditions.
The greatest loss in strength of grip is found in the control group, but the greatest gain is also in this group.
in a test or trial, a group that does not receive the new treatment being studied and which is compared to the group that does receive the new treatment
control group n.
A group used as a standard of comparison in a control experiment.