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Unformatted text preview: Accept the null, but the null is false probability of making a Type II error is related to power Type III and Type IV Errors Type III Error Getting the direction wrong Type IV Error Improper interpretation of an interaction What Does “ p < .05” Mean? Low probability differences were due to random error p = .05 does not mean that 5 times out of 100 you would get a different result. p(H:E) p value tells us “p(E:H)” What is the probability of obtaining a dead person (D) given that this person was hanged(H)? p(D:H) This is what a p value tells us What is the probability that a person has been hanged given that the person is dead? p(H:D) Number of Research Participants Cohen (1988) Wahlstein (1991): 90% power, ES=.20...
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 Fall '11
 Whatley
 Statistics, Experimental Psychology, Statistical hypothesis testing, Type I and type II errors, Probability levels Hypothesis, error variance Type

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