9. During the past six years, **** has graduated a populationaverage of µ = 43 percent of the freshmen who were admitted with apopulation standard deviation of ? = 5. An experimental newadvising program was tried on a sample of n = 49 students and anaverage of M = 45 percent graduated within six years. Perform ahypothesis test to determine if significantly MORE students in thenew advising program graduated when compared to the populationmean. Please follow the four steps and compute the effect size(cohen’s d), and please interpret the results. (Note: one-tailedhypotheses test should be performed)
a. T=2.8, reject null. Cohen’s d=0.5, medium effect.
b. Z=2.8, failed to reject null. Cohen’s d=0.8, smalleffect.
c. T=2.8, reject null. Cohen’s d=0.2, large effect.
d. Z=2.8, reject null. Cohen’s d=0.5, medium effect.
