Not necessarily. It may be one that the experimenter has no control over.
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The independent variable is the value being manipulated or changed, while the dependent variable is the observed result of the independent variable being manipulated. "IF" you change the independent variable, "THEN" what happens to the dependent variable?
independent variable
Independent variable
That's the independent variable.
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.