In an A-A1-B-A1-B design,
A) A1 refers to a time when a placebo is in use
B) A and A1 refer to two different types of treatments being compared
C) at least three different baselines will be established at different times
D) A and A1 refer to two people, an experimental subject and a control subject

Question

Quizplus · Accepted Answer

In an A-A1-B-A1-B design, A and A1 refer to different points in time when the same treatment or intervention is provided. A1 typically refers to a time when a placebo, inactive substance, or no treatment is being used as a control condition. Therefore, option A is correct. B, C, and D are incorrect as they do not accurately describe the purpose or meaning of A and A1 in this type of design.

In an A-A1-B-A1-B Design