It can be but not always. The experimenter may just have to take the independent variable as it happens.
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An independent variable is the factor that is manipulated by the experimenter in an effort to study the effects of the change upon the dependent variable.
the variable
An independent variable is a factor that doesn't rely on anything, unlike the dependent variable (which relies on the independent variable). The most common independent variable is time.
Its the independent one; because you change it, the dependent variable will be affected.
An independent variable is a factor that is changed by the controller of the experiment.