When you are doing a test of a drug, the control group is the group that gets the placebo.
If you want to see if a drug will work the way that you want, you need to give it to two groups. One group that will get the drug and one that will not. But, they will get something that looks just like the same. The same color, size, etc.
The one that gets the placebo (fake) is called the control group.
A control refers to the "control group" in a scientific experiment. The control group is compared to the experimental group. For example, pretend you are experimenting to see if a drug works. Group A (The experimental group) is given the real drug, and Group B (The control group) is given a fake drug (placebo) to compare results.
In experimentation we need two kinds of group participation: experimental group and control group. The purpose of having control group is to have comparison between this group and the experimental group.Because control group receives no treatment unlike the other group which is under experimentation and receives treatment.
Usually experimental versus control group are used in testing the affects of new medicines. Within the group being tested some will be in the experimental group and some in the control group, however the people are unaware of which group they are in. The scientists will give the experimental group the new medicine and the control group a placebo, something that has no affect. Then the affect of the new medicine will be revealed comparing the experimental group to the control group.
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