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The controlled variable is the variable that is kept constant , meaning not changed, throughout the entire experiment.
It means that your observation of the subject in question has not been constant or to plan.
I hope this helps you out a lot. If you are asking what a dependent variable is, here is your answer: A dependent variable is a variable which would be the output of the experiment. The value of the dependent variable depends on the value of the independent variable. If you are asking what a dependent variable does, here is your answer: A dependent variable shows you the output of the experiment. It shows you the independent variable's function. If you have learned that in Math, you should understand. Source(s): I'm a Science and Math whiz.
The dependent variable.
The dependent variable is the variable that depends on the independent variable.