A control variable is the one that stays the same. A controlled variable is a variable that is kept the same between the control group and experimental group, so that only the … experimental (independent) variable is allowed to change.+ 41 others found this useful.hat are kept constant to ensure that it is only the Independent Variable causing an effect on the Dependent Variable. 2 people found this useful. Edit. Share to: 1  A Look at JavaScript Variable Types Similar to other programming languages, JavaScript variables are containers used to hold values and expressions.