In a typical experiment, what is the experimental group?
Select one:
The sample that directly tests the validity of the hypothesis; it is often the sample
that receives the treatment.
The sample that serves as a base-line or reference point for comparison to the
experimental group; often the treatment is omitted or held at some natural level.
The factor that is manipulated by the investigator and should be the one thing that
differs between the experimental group and control group. It is often called the
treatment.
It is what is observed, counted, or measured by the investigator.
