A control group is a group of people or things that are treated similarly to an experimental group, except for the factor being tested. It is used to compare and see the difference caused by the factor being tested. Full definition
After an average of five weeks, 51 % of the students in the blended program were eligible to advance, compared to merely 22 % of the students in control groups. (elearningindustry.com)
All of the studies included control groups of people who did get enough sleep — 7 to 12 hours in bed at night. (health.com)
That was compared with control groups receiving only 13 percent to 17 percent from fat, with carbohydrate calories making up the bulk of the difference. (healthline.com)