For which of the following designs is multiple treatment interference a substantial threat?
A) Time series design.
B) Counterbalanced design.
C) Solomon Four group design.
D) Posttest-only control group design.

Question

Quizplus · Accepted Answer

In a Solomon Four group design, participants are randomly assigned to one of four groups: pretest-posttest control group, pretest-posttest experimental group, posttest-only control group, and posttest-only experimental group. This design is particularly susceptible to multiple treatment interference because participants in the posttest-only groups may be affected by both the pretest and the experimental manipulation, which can lead to confounding variables and biased results.

For Which of the Following Designs Is Multiple Treatment Interference