a control variable is a variable that needs to be controlled
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There is no answer to a manipulated variable because "a manipulated variable" is not a question!
Not necessarily. It may be one that the experimenter has no control over.
operational definition of a manipulated variable
A manipulative variable is the variable you can alter, while the responding variable is the variable you have no control over. A manipulated variable is what is changed purposely throughout the experiment. The responding variable is which you have to measure to get your results I think. But the responding variable depends on the dependent variable. I believe I'm right!
A manipulated variable is not changed on purpose.