関連ワード:  what is the purpose of using a control variable in research    what is the role of control variables in research    what is the aim of using control variables in research    what is the use of independent variable in research    what is the role of independent variable in research    what is the role of control variable in scientific research    what is the purpose of an independent variable in a research study    what is the purpose of manipulating an independent variable in experimental research    what is a control variable in research    what is the meaning of control variable in research  
結果 : what is the purpose of a control variable in research