SIGNIFICANCE LEVEL By N., Sam M.S. - 13 Null hypothesis significance testing. the probability of rejecting the null hypothesis when it is true. The probability of a type 1 error. also called alpha level. SIGNIFICANCE LEVEL: "The significance level is the probability of making a type 1 error." Related Psychology Terms BRAIN WAVES (Electroencephalogram, EEG) Piaget’s Theory of Cognitive Development CLINICAL PSYCHOLOGY LEVEL OF ASPIRATION RISK LEVEL T TEST POWER DREAM INTERPRETATION (Historical) EXPERIENTIAL THERAPY NONCENTRALITY PARAMETER Cite this page: N., Sam M.S., "SIGNIFICANCE LEVEL," in PsychologyDictionary.org, April 13, 2013, https://psychologydictionary.org/significance-level/ (accessed July 3, 2022).