What is the difference between a manipulated variable and controlled variable?
The controlled variable is the observation that is measured before and after the experiment. This provides the observable changes. The manipulated variable is the item that is changed during the experiment to obtain different data. Example: You are testing the heat that plants are healthiest. The heat is the manipulated variable, and the plant is the controlled variable. The controlled variable is always kept in the same condition (except of course, for the manipulated variable). There is usually only one manipulated variable, but there might be more than one controlled variable.
