Answer Happy

18. To evaluate the effect of a treatment, a sample of n = 8 is obtained from a population with a mean of u = 50, and the treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be M = 55. a. Assuming that the sample variance is 52 = 32, use a two-tailed hypothesis test with a = .05 to determine whether the treatment effect is significant and compute both Cohen's d and to measure effect size. b. Assuming that the sample variance is g? = 72, repeat the test and compute both measures of effect size. c. Comparing your answers for parts a and b, how does the variability of the scores in the sample influence the outcome of a hypothesis test and measures of effect size?