Recall the Tire Tread Comparison from Class 04: A tire manufacturer is interested in investigating the handling properties for different tread patterns. Data were recorded on the stopping distances measured to the nearest foot for a standard sized car to come to a complete stop from a speed of 60 miles per hour. There are six measurements of the stopping distance for each of four different tread patterns labeled A, B, C and D. The same driver and car were used for all 24 measurements and, although not clear from the saved data file, the order of treatments were assigned at random