(1-β) The probability of rejecting the null hypothesis when it is false. The power is equal to one minus the Type II decision error rate, i.e. (1-β)
U.S. Environmental Protection Agency, Radiation Glossary, Office of Radiation and Indoor Air Radiation Protection Division, Washington, DC, USA 2013. http://www.epa.gov/radiation/glossary/index.html#a , (Dzstr/ Rad Emr - Amer) {823}