Hypothesis testing Definition of size and power H true H false Accept correct Type I error Reject type i error correct Size=Pr(Type I error) Power=l-Pr(type II error) Tradeoff between size and power Fix size find most powerful testHypothesis testing • Definition of size and power • H true H false • Accept correct Type II error • Reject type I error correct • Size=Pr(Type I error); • Power=1-Pr(type II error); • Tradeoff between size and power; • Fix size, find most powerful test