A study of firefighters in a large urban area centered on the physical fitness of the engineers employed by the fire department. To measure the fitness, a physical therapist sampled five engineers each with 5, 10, 15, and 20 years’ experience with the department. She then recorded the number of push-ups that each person could do in 60 s. The results are listed in Table 6.39. Perform an analysis of variance to determine whether there are differences in the physical fitness of engineers by time with the department. Use α = 0.05.

318 CHAPTER 6: Inferences for Two or More Means Table 6.39 Number of Pushups in 60s by Time with the Department Time with Department (Years)

5 10 15 20 56 64 45 42 55 61 46 39 62 50 45 45 59 57 39 43 60 55 43 41 LO.1