March 17, 2008

March 17, 2008 - in the dependent variable P null the...

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March 17 Outline I. Review of statistical power II. Calculating power with the sign test A. Assume H 0 is true ( P null = .50). Determine outcomes that allow H 0 to be rejected B. For assumed P real value, determine probability of these outcomes (from Step 1) III. Examples A. Variation in P real , N, alpha, one/two tail B. Effect on β (β = 1 – Power)
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Power: the probability that the results of an experiment will allow the rejection of H 0 if the independent variable has a real effect Real effect: an effect that produces a change
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Unformatted text preview: in the dependent variable P null : the probability of getting a plus with any participant in the sample of an experiment when the independent variable has no effect (P null = .50) P real : the probability of getting a plus with any participant in the sample of an experiment when the independent variable has a real effect; also, the proportion of pluses in the population if the experiment were done on the entire population and the independent variable has a real effect...
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March 17, 2008 - in the dependent variable P null the...

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