How does a control group function in an experiment?

1. It’s a group separated from the rest of the experiment.
2. It’s a group separated from the rest of the experiment but are still included in the test.
3. It’s a group included with the experiment but are still partialy separated from the experiment.
4. It’s a group included with the experiment.

Correct Answer :

• It’s a group separated from the rest of the experiment.