A control group is a group in an experiment that is under normal conditions. If one was testing out fertilizer, the control group would be a plant with just normal dirt. A control group is a group in an experiment that is under normal conditions.
The experimental group is given the experimental treatment and the control group is given either a standard treatment or nothing. For example, lets say you wanted to know if Gatorade increased athletic performance.
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A scientific control group is an essential part of many research designs, allowing researchers to minimize the effect of all variables except the independent variable. The control group, receiving no intervention, is used as a baseline to compare groups and assess the effect of that intervention.