Pretest-posttest control group and Solomon four-group designs are ________ distinguished by the fact that the researcher can randomly assign test units to experimental groups and also randomly assign treatments to experimental groups.
A) preexperimental designs
B) quasi-experimental designs
C) statistical designs
D) true experimental designs

Question

Quizplus · Accepted Answer

Both pretest-posttest control group and Solomon four-group designs are true experimental designs, which involve random assignment of participants to different experimental groups and treatments. Quasi-experimental designs (B) do not involve random assignment, while statistical designs (C) generally refer to the techniques used to analyze data, rather than the design of the study itself. Preexperimental designs (A) typically lack a control group and random assignment.

Pretest-Posttest Control Group and Solomon Four-Group Designs Are ________ Distinguished