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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.
Summary of Differences. 1  In science, for one independent variable, there may be more than one dependent variable. 2  The value of an independent value can be changed. 3  The independent variable is the value which is manipulated in an experiment. The dependent variable is the value observed by the researcher during an experiment. Knowing the differences between independent and dependent variables will help as you as you sharpen your problem solving skills and continue to explore new concepts within the fields of mathematics and the science.