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Answer» They help you identify and compare the results.
For example, you want to find out if a CERTAIN substance is makes people get full FASTER. So you have three groups: A- has two drops of the substance in it, B- has one , C-(control) has none. And you give them all free ACCESS to buffets.
By the end of the day you know how much each group ate, and you compare it with the control. If groups A and B ate the same average amount as C, the substance doesn't work.
If A and B ate the same, but less than C, it means it works, but you'll need more than two drops to make a bigger DIFFERENCE.
If A are less than B, that ate less than C it means that not only the substance works, but one DROP makes quite a difference in the results.
In conclusion, Control is important because without it you'd have no way to understand the results after an experiment happened .
HOPE IT HELPS
YOU......
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