Exhibit 11-2 Refer to the following key:
R = random Assignment
X = experimental treatment
O = pretest or posttest observation
Refer to Exhibit 11-2.R O X O O represents the
A) nonequivalent control group design
B) multiple conditions design
C) pretest-posttest control group design
D) posttest only control group design

Question

Quizplus · Accepted Answer

The design represented by R O X O O is the pretest-posttest control group design, where participants are randomly assigned to a treatment group or control group, and both groups are measured before and after the treatment. The use of a pretest allows for control of initial differences between the groups, making it a stronger design than the posttest only control group design (D). The nonequivalent control group design (A) involves two non-randomly assigned groups, and the multiple conditions design (B) involves more than one treatment group.

Exhibit 11-2 Refer to the Following Key