The independent variable is the one factor that will be manipulate or changed during the experiment....
The dependent variable is the variable that becomes altered as a result of the change that was made in the independent variable...
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An dependent variable is one that you measure. The independent variable is one you set at various levels. A constant variable seems to be bad English. It refers to things that could vary (a variable) but that you hold constant so that they have no effect on the experimental results (more or less).