Table 1.

Statistical inference decision table

Inferential DecisionUnknown but True State of the World
H0 TrueH0 False
Reject H0Type I errorCorrect decision
Probability = aProbability = 1 − b
Do not reject H0Correct decisionType II error
Probability = 1 − aProbability = b
  • a, type I error rate; b, type II error rate (1 − b is power).