A computer manufacturer is introducing a new product specifically targeted at the home market and wishes to compare the effectiveness of three sales strategies: computer stores, home electronics stores, and department stores. Numbers of sales by 15 salespeople are recorded below:
Electronics store: 5, 4, 3, 3, 3
Department store: 9, 7, 8, 6, 5
Computer store: 7, 4, 8, 4, 3
a. Test the hypothesis that there is no difference between the means of the retailers (α = .05).
b. Select a multiple comparison test, if necessary, to determine which groups differ in mean sales (α = .05).