The answer depends on what the experiment is trying to establish.
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Independent variable is what you, the experimenter, change or enacts in order to do your experiment
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,
It can, but need not, affect the outcome of the experiment variable.
When you do an experiment the variable you control is the independent variable, and the variable you measure is the dependent variable.