What is the importance of group control set up in an experiment?

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In designing an experiment, there is a need to change some parameters in order to get different results to justify a certain claim or hypothesis. Groupings are made based on the parameter being set. These can be the experimental and the controlled group.

The experimental group is where the researcher aims to seek results of the changes in the action of a particular experiment. The control group on the other hand is a group separated from the experimental set up. This group however is treated exactly like those of the experimental group. The only difference is that in the control group, the variable in the experimental group is not present. 

The importance of the control group is employed in an experiment to see if there is an observable result when the variables are removed. This is also useful when the samples are complex and harder to determine. 

Consider this illustration as an example:

Hypothesis: Cells exposed to toluene become cancer cells

Experimental group: Cells that are exposed to toluene

Controlled group: Cells that are not exposed to toluene

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