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Statistics

To test effectiveness of treatment, a sample of n = 25 people is chosen from normal population with mean of µ = 60. After treatment is administered to individuals in sample, sample mean is found to be M = 55.

a. Calculate Cohen's d measure effect size for both tests (σ = 20 and σ = 10).
b. Briefly explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?

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