the controlled variables are the variables that you are controlling, (ex) the amount of water fed to plants in an experiment testing the effect of different amounts of fertilizer on those plants, and a control group would be the group of plants that you are adding not fertilizer to, The group in which you are not manipulating the independent variable.|||The control group is the set of subjects for which nothing changes. You'll be measure changes in the test group against them.
The controlled variables are the things that you are changing between the control group and the test group.
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