the antonym of a control group

[piousoul]

Research has shown that coctail waitresses could regularly remember as many as twenty drink orders at a time, far more than a control group consisting of university students.

I forgot how to name the opposite of a control group; please refresh my memory with the right term. Thanks.

[Mister Micawber]

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There are various: experimental group, test group, treatment group.
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[piousoul]

Originally Posted by Mister Micawber

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There are various: experimental group, test group, treatment group.
.

Thanks, Mister Micawber.
Yes, they are experimental group, test group, and treatment group.