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

1. If the population standard deviation is = 10, can you conclude that the treatment has a significant effect? Use a two-tailed test with = .05.
2. If the population standard deviation is = 20, can you conclude that the treatment has a significant effect? Use a two-tailed test with = .05.
3. Compute Cohen’s d to measure effect size for both tests ( = 20 and = 10).
4. Briefly describe how the standard deviation influences the outcome of the hypothesis test. How does influence measures of effect size?

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