A researcher selects a sample of n=25 individuals from a population with a mean of =60 and standard deviation of =10 and administers a treatment. The researcher predicts that the treatment will increase scores. Following the treatment, the average scores for this sample is M=65. a. Using symbols, state the hypothesis for a one-tailed test. b. Calculate the z-score and place this on a standardized normal distribution. c. With a one-tail =0.05, state the conclusion of these findings. d. Calculate Cohen's d and state the effect size (i.e., small, medium, large)