Dr. grant is conducting research on stress management. group a received progressive relaxation training prior to test taking, while group b received no training. group a is the while group b is the

experimental group/control group                        

Explanation:

Experimental group: The term experimental group is defined as a particular group in an experiment or research that encounters a treatment. The experimental group is also referred to as a treatment group. It encompasses test subjects including animal or person etc and a variable that the researcher is interested in studying.

Control group: The control group is described as one of the groups in an experiment or research that does not encounter any treatment by the experimenter or the researcher and is being used as a basis to identify or calculate another tested subjects.