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A researcher is estimating influence of treatment using sample selected from normally distributed population with mean of µ = 80 and standard deviation of σ = 20. Researcher expects 12 point treatment effect and plans to use two-tailed hypothesis test with u α = .05

a. Calculate the power of test if researcher uses a sample of n = 16 individuals.
b. Calculate power of test if researcher uses sample of n = 25 individuals.

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