Refer to the International Journal of Engineering Science and Technology (February 2011) study of public bus depot performance. Exercise 9.23 (p. 508). Recall that 150 customers provided overall performance ratings at each of three different bus depots (Depot 1, Depot 2, and Depot 3). The average performance scores were determined to be significantly different at a = .05 using an ANOVA F-test. The sample mean performance scores were reported as 1 = 67.17, 2 = 58.95, and 3 = 44.49. The researchers employed the Bonferroni method to rank the three performance means using an experiment-wise error rate of .05. Adjusted 95% confidence intervals for the differences between each pair of treatment means arc shown in the table. Use this information to rank the mean performance scores at the three bus depots.
Comparison Adjusted 95% CI
(µ1 - µ2)............................ (1.50, 14.94)
(µ1 - µ3) ............................ (15.96, 29.40)
(µ1 - µ3) ............................ (7.74, 21.18)