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

Multiple Choice

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