A Group of Physicians Tests a New Drug for Treating

Multiple Choice

A group of physicians tests a new drug for treating Attention Deficit Disorder (ADD) . They randomly assign 40 children with ADD to the experimental and control groups (20 per group) . They then measure the amount of time each group of ADD students attend to a task during a specified hour one week prior to the treatment group taking the new drug and during a specified hour one week after the treatment group takes the new drug. The physicians used what type of design to test the drug?

A) One-group posttest-only design
B) Pretest-posttest control-group design
C) Posttest-only design with nonequivalent groups
D) Nonequivalent posttest-only design