The variable manipulated by the researcher in an experimental study is the

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The independent variable is the one that the researcher deliberately changes or manipulates in order to see whether it has an effect on the dependent variable. The control variable is the one that the researcher keeps constant or consistent in order to eliminate its potential influence on the results. The placebo is a substance or treatment that has no real therapeutic effect but is given to a control group in order to create a comparison for the experimental group that receives the active treatment. The dependent variable is the outcome or response that the researcher measures or observes and that is supposed to be affected by the independent variable.

The Variable Manipulated by the Researcher in an Experimental Study