Final answer:
The statement is true; a functional relationship in a multiple baseline design across subjects is demonstrated when each subject's behavior changes after the treatment is implemented.
Step-by-step explanation:
True or false: A functional relationship between the treatment and the behavior is demonstrated in a multiple baseline across subjects design when the behavior of each subject changes only after the treatment is implemented for that subject.
This statement is true. A multiple baseline design is used in behavioral research to establish the effectiveness of a treatment by demonstrating that changes in behavior occur specifically after the treatment is applied and not due to external factors. It involves introducing the treatment at different times across different subjects or settings, and a functional relationship is shown when each subject's behavior changes after the treatment is implemented, while behaviors not yet exposed to the treatment remain unchanged.