Question: A random sample of n = 25 scores is obtained from a population with a mean of = 45. A treatment is administered to

A random sample of n = 25 scores is obtained from a population with a mean of μ = 45. A treatment is administered to the individuals in the sample and, after treatment, the sample mean is M = 48.
a. Assuming that the sample standard deviation is s = 6 compute r2 and the estimated Cohen's d to measure the size of the treatment effect.
b. Assuming that the sample standard deviation is s = 15, compute r2 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 the measures of effect size?

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