Which of the following designs permits a comparison of pretest scores to determine the initial
equivalence of groups on the pretest before the treatment variable is introduced into the research
setting.
a. One-group pretest-posttest design
b. Pretest-posttest control group design
c. Posttest-only design with nonequivalent groups
d. Both b and c
equivalence of groups on the pretest before the treatment variable is introduced into the research
setting.
a. One-group pretest-posttest design
b. Pretest-posttest control group design
c. Posttest-only design with nonequivalent groups
d. Both b and c