Final answer:
Experimental investigations enable control of variables in studies, with the experimental group receiving treatment while the control group does not, facilitating the determination of variable effects.
Explanation:
Experimental investigations allow for the control of variables. In an experimental study, researchers can observe phenomena while holding other variables constant or controlling them. The experimental group receives the treatment, while the control group does not, enabling the researchers to determine the effect of the independent variable on the dependent variable.
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