The manipulative variable.
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A manipulated variable is not changed on purpose.
it is the variable that is changed by the manipulated variable, which is to purposely change a variable to see if it has any affect. the part that has effect is the responding variable
The independent variable is the variable which you change. It is not changed by any outside factors and so is independent of them.The dependent variable is the variable which is changed by the independent variable changing and which you measure. It is dependent on another variable.
The independent (or explanatory) variable is changed to test the prediction,
The variable is the letter, the thing that can be changed.