A control is like your base.
So you would have 1 person who you would just leave normal.....
Then on the
others you experiment.... give one Drug A + Drug B, give another Drug A + Drug C, etc... etc....
It is a way to measure what exactly is making the changes/ and what the changes are.....
Here is an example.....
An example of an experimental control might be testing plant fertilizer by giving it to only half the plants in a garden: the plants that receive no fertilizer are the control group, because they establish the baseline level of growth that the fertilizer-treated plants will be compared against. Without a control group, the experiment cannot determine whether the fertilizer-treated plants grow more than they would have if untreated.
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