A random sample of n = 16 scores is obtained from a population with a mean of u ment is administered to the individuals in the sample, the sample mean is found to be M = 49.2. a. Assuming that the sample standard deviation is s = 8, compute r and the estimated Cohen's d to measure the size of the treatment effect. %3D 45. After a treat- b. Assuming that the sample standard deviation is s = 20, compute r and the estimated Cohen's d to measure the size of the treatment effect. c. Comparing your answers from parts a and b, how does the variability of the scores in the sample influence theneasures of effect size?

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