In an experiment, the control variable (f) is kept constant to ensure that any observed changes in the response variable (g) can be attributed to the manipulation of the independent variable. The extraneous factors (h and k) are variables that could potentially influence the results but are not the focus of the study. The specific units of these variables are referred to as the treatments of the experiment, which represent the different conditions or levels applied to the response variable to evaluate its effect. By carefully controlling these variables, researchers can draw more reliable conclusions from their experiments.
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