A researcher wishes to un an experiment, but is concerned that variations in the subjects’ intelligence quotients (Iq) might confound the results. All of the following are possible solutions to this problem except for ___________?

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A researcher wishes to un an experiment, but is concerned that variations in the subjects’ intelligence quotients (Iq) might confound the results. All of the following are possible solutions to this problem except for ___________?

A. using a matched-subjects design
B. Higher IQ level relatively constant
C. running a double-blind experiment
D. randomly assigning subjects to groups