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Control variable
The control variable (or scientific constant) in scientific experimentation is the experimental element which is constant and unchanged throughout the course of the investigation. The control variable strongly influences experimental results, and it is held constant during the experiment in order to test the relative relationship of the dependent and independent variables. The control variable itself is not of primary interest to the experimenter.
==Usage==
A variable in an experiment which is held constant in order to assess the relationship between two other variables, is the control variable.〔(''control variable'' ); Business Dictionary online; retrieved September 2015.〕〔(''Definitions'' ); Science Buddies – Science Fair Projects.
〕 A control variable is the one element that is not changed throughout an experiment, because its unchanging state allows the relationship between the other variables being tested to be better understood.〔PPT Download; (); 〕
Essentially, a control variable is what is kept the same throughout the experiment, and it is not of primary concern in the experimental outcome.〔〔 Any change in a control variable in an experiment would invalidate the correlation of dependent variables (DV) to the independent variable (IV), thus skewing the results.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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