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a control variable is a variable that needs to be controlled
A control variable is a variable that is held constant in a research analysis.
An independent variable is when you do not control what happens In an experiment,however; a dependent variable is when you actually control the experiment,
When you do an experiment the variable you control is the independent variable, and the variable you measure is the dependent variable.
In a controlled experiment, the control variable remains constant while the experimental variable changes with each trial of the experiment.