The president of a new car dealership professional association wishes to study the number of hours department heads spend on the floor of their shops weekly by department. The manager selected a sample of five department heads from each of three shops from among area dealerships. At the .05 significance level, can she conclude there is a difference in the mean number of hours spent on the shop floor by department heads, by department?
Body Shop Mechanical Repair Shop Make-Ready Shop
48 35 15
55 33 25
20 31 33
23 37 36
15 40 22
Attached Excel file performs an ANOVA to find if the difference in means is valid at the 0.05 significance level.