In a Nonequivalent Control Group Design, Researchers

Multiple Choice

In a nonequivalent control group design, researchers

A) choose two existing groups of people, one of which is randomly assigned to the experimental group and the other to the control group.
B) observe a dependent variable over extended periods of time both before and after a treatment is instituted to detect changes associated with the treatment.
C) select a control group after data have been collected to control for holes in the design's internal validity
D) do any of the above.