1. A wash out period is a classic example of a parallel group design. True/false

2. In a parallel group design, the subject undergoes random assignment to AB or BA and serves as his/her own control. True/false

3. Trials that show equivalence or non-inferiority tests the null hypothesis that the new treatment performs differently than the active control by some small amount.

True/false

4. When considering early stopping a trial that looks at safety, more evidence is needed than when considering early stoppage of an efficacy trial.

True/false