# What is a control group?

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Gamaliel B.
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Jan 16, 2015

In an experimental study you need at least two groups. The treatment group/s and the control group.

Control group receive no treatment. Why? the answer is simple.

Control group would be the basis if the treatment is effective.

Suppose you want to determine if the fertilizer A boost the growth rate of a certain plant.

Let plot X be the control group and ploy Y be the treatment group..

Simply use Two sample t-test for these two groups. If it happened that the two groups did not significantly differ then the fertilizer A is not effective in boosting the growth rate of plants.

Hope this help.

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