1. In general, how does a phase-change design like the ABAB reversal design demonstrate that the treatment (rather than chance or coincidence) is responsible for causing changes in behavior? 2....

1. In general, how does a phase-change design like the ABAB reversal design demonstrate that the treatment (rather than chance or coincidence) is responsible for causing changes in behavior?

2. Explain why an ABAB reversal design is inappropriate for a treatment that has a permanent or long-lasting effect.