Question: End-user computing study. The Journal of Computer Information Systems (Spring 1993) published the results of a study of end-user computing. Data on the ratings of 18 specific enduser computing (EUC) policies were obtained
for each of 82 managers. (Managers rated policies on a 5-point scale, where 1 = no value and 5 = necessity.) The goal was to compare the mean ratings of the 18 EUC policies; thus, a randomized block design with 18 treatments (policies) and 82 blocks (managers) was used. Since the ANOVA F-test for treatments was significant at α = .01, a follow-up analysis was conducted. The mean ratings for the 18 EUC policies are reported in the table. Using an overall significance level of α = .05, the Tukey critical difference for comparing the 18 means was determined to be ω = .32.
(a) Determine the pairs of EUC policy means that are significantly different.
(b) According to the researchers, the group of policies receiving the highest rated values have mean ratings of 4.0 and above. Do you agree with this assessment?