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These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.The independent variable is the one that is changed by the scientist.To ensure a fair test, a good experiment has only one independent variable.n experiment usually has three kinds of variables: independent, dependent, and controlled. The independent variable is the one that is changed by the scientist. To ensure a fair test, a good experiment has only one independent variable.
What is a controlled variable in science? Scientists do not manipulate the dependent variable in an experiment. An example of a dependent variable is the test score of a student; the independent variable for an experiment investigating that might be the amount of time a student has to revise.