Question

Which group in an experiment, is a test group that isn't exposed to the experimental variable?

Answer 1

This is the definition of a control group.

Explanation:

Control groups figure prominently in medical testing (e.g trials of a drug). They provide a way to measure the natural variation from one subhect to another, and to determine whether the apparent effect of the treatment being tried is in fact beyond what can be explained by this natural variation.