A random sample is obtained from a population with a mean of μ = 70. A treatment is administered to the individuals in the sample and, after treatment, the sample mean is *M *= 78 with a standard deviation of *s *= 20.

**a. **Assuming that the sample consists of *n *= 25 scores, compute *r*2 and the estimated Cohen’s *d *to measure the size of treatment effect.

**b. **Assuming that the sample consists of *n *= 16 scores, compute *r*2 and the estimated Cohen’s *d *to measure the size of treatment effect.

**c. **Comparing your answers from parts a and b, how does the number of scores in the sample influence the measures of effect size?

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