The advantage of adding the pretest in the nonequivalent control group design is that it
a. guarantees that the maturation threat to internal validity will not be a problem.
b. lets the researcher know if the selection threat to internal validity has resulted in groups that differ at the start of the study.
c. lets a researcher adjust the sample if there is a high level of attrition among participants.
d. increases the validity of the design by allowing for counterbalancing of groups.
b
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