The management of fast-food restaurants is extremely interested in knowing how their customers rate the quality of food and service and the cleanliness of the restaurants. Customers are given the opportunity to fill out customer comment cards. Suppose that one franchise wanted to compare how customers rate the three shifts (4:00 p.m. to midnight, midnight to 8:00 a.m., and 8:00 a.m. to 4:00 p.m.). In a preliminary study, 100 customer cards were randomly selected from each shift. The responses to the question concerning speed of service were recorded, where 4 = Excellent, 3 = Good, 2 = Fair, and 1 = Poor, and are listed here. Do these data provide sufficient evidence at the 5% significance level to indicate whether customers perceive the speed of service to be different between the three shifts?