An experimental variable is something that a scientist changes during the course of an experiment. It is distinguished from a controlled variable, which could theoretically change, but the scientists keep constant. More »

In science, the control variable is the one factor in an experiment that the researcher holds steady in an effort to isolate the effect that is being studied. According to About.com, it is also sometimes referred to as t... More »

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In experimental research, researchers use controllable variables to see if manipulation of these variables has an effect on the experiment's outcome. Additionally, subjects of the experimental research are randomly assig... More »

A controlled variable is the element or feature that cannot be changed during the course of an experiment. The controlled variable is kept constant so the changes in other variables can be observed more easily. According... More »

A manipulated variable is a facet of an experiment that researchers or scientists change in order to see how the outcome of the experiment changes. The manipulated variable is also called the independent variable, and it... More »

The term "direct variation" refers to a mathematical correlation between two variables where one variable can be represented as a constant multiple of the other unknown quantity. It is also known as a "direct proportion.... More »

www.reference.com Math Algebra

In math, a dependent variable is one in an expression, equation or function that depends upon one or more other variables' values to determine its value. The dependent variable is usually isolated on one side of an equat... More »