Again, working with the data in Exercise 13-11, the number of cars that arrive in each 10-minute period is a factor that will determine whether Big Boy has the capacity to handle the drive-thru business. In addition to studying the service times, the owners counted the number of cars that arrived at a deli in the nearby town in a sample of 10-minute time periods. These data are in a file called Drive-Thru Traffic.

Based on these data, is there evidence to conclude that the arrivals are not Poisson distributed? State the appropriate null and alternative hypotheses, and test using a significance level of 0.025.