why is a control group necessary in the experimental method?|||Scientific controls allow experiments to study one variable at a time, and are a vital part of the scientific method. In a controlled experiment, two virtually identical experiments are conducted. In one of them, the treatment, the factor being tested is applied. In the other, the control, the factor being tested is not applied.
For example, in testing a drug, it is important to carefully verify that the supposed effects of the drug are produced only by the drug itself. Doctors achieve this with a double-blind study in a clinical trial: two (statistically) identical groups of patients are compared, one of which receives the drug and one of which receives a placebo. Neither the patients nor the doctor know which group receives the real drug, which serves both to curb bias and to isolate the effects of the drug.
For example we take twenty rats, we give half of them a medicine and the other half no medicine so any difference that is measured between the two groups should be a result of the medicine's effect. Ya-yah.
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