N = 20 sum of d= 96 sum (d-d)^2 =560 Twenty managers were selected for a test to determine whether exposure to ethics training changed managerial decision results. At the beginning of the day, the managers were presented with a case and scored on the basis of their answers to some ethical questions. Following a day of training, they were presented with a similar situation and given a second score based on their responses. Use the data below for a difference between means of paired samples test of H0: μ1 = μ2 n = 20 a. Find d-bar, sd, and t b. Did the training result in a significant change in the managers’ decision-making? Use a level of significance of 0.05.