Explanatory (or predictor) variable: A variable which is used in a relationship to explain or to predict changes in the values of another variable; the latter called the dependent variable.
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As the explanatory variable increases, the response variable increases
the variable age has discriptive value but not necessarily explanatory value.
The independent (or explanatory) variable is changed to test the prediction,
independent variable called also predictor variables,explanatory variables,manipulated variables etc.
True