The following data are from an experiment designed to investigate the perception of corporate ethical values among individuals specializing in marketing (higher scores indicate higher ethical values).
Marketing Managers Marketing Research Advertising
6 5 6
5 5 7
4 4 6
5 4 5
6 5 6
a) Use α = .10 to test for significant differences in perception among the three groups.
b) At α = .10 level of significance, can we conclude that there are differences in the perceptions for marketing managers, marketing research specialists, and advertising specialists. Use Fisher's LSD approach to determine where the differences occur.