When studying an active independent variable, the intervention or treatment given to a group of participants is called the

The group that receives the intervention or treatment of an active independent variable is the experimental group.

Its response is compared against a group that receives no treatment.

The control group is precisely the one that does not receive the treatment.

Naming both experimental and control groups is wrong, since only one actually receives the treatment.

An extraneous group is not a standard experimental grouping at all.

Random assignment to experimental and control groups helps equate them before treatment.