Calculate cohens d measure effect size for both tests sigma, Ask an Expert

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1.To test effectiveness of treatment, sample of n = 25 people is selected 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. If population standard deviation is σ = 10, can you conclude that treatment has significant effect? Use two-tailed with α = .05.

b. If population standard deviation is σ = 20, can you conclude that treatment has significant effect? Use two-tailed test with α = .05.

c. Calculate Cohen's d measure effect size for both tests (σ = 20 and σ = 10).

d. Explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?

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