The Environmental Protection Agency (EPA) performs extensive tests on all new car models to determine their mileage ratings. The results of 100 EPA tests on a certain new car model are displayed in Table 4.5. Numerical and graphical descriptive measures for the data are shown on the Minitab and SPSS printouts, Figures 4.37a–c.

Determine whether the EPA mileage ratings are from an approximate normal distribution.

Figure 4.37a

Figure 4.37b

Figure 4.37c

Transcribed Image Text:

Table 4.5 EPA Gas Mileage Ratings for 100 Cars (miles per gallon) 41.0 36.9 30.0 37.2 36.3 32.7 37.3 41.2 33.2 37.4 40.5 36.5 37.6 36.4 37.7 37.7 36.2 37.9 36.0 38.2 38.3 35.7 38.5 39.0 35.5 39.4 36.3 36.8 32.5 36.6 41.0 31.8 37.3 37.6 37.0 37.0 37.2 37.8 37.1 40.3 40.1 39.9 36.9 34.0 40.7 36.7 32.9 37.1 44.9 36.6 33.9 37.9 34.8 36.8 32.9 36.5 40.2 35.9 38.6 36.4 40.5 33.1 37.0 37.4 37.0 33.8 37.1 33.9 39.8 35.3 34.4 36.1 38.2 38.7 35.9 35.6 38.0 35.2 36.8 35.0 42.1 37.5 40.0 35.6 38.8 38.4 39.0 36.7 34.8 38.1 36.7 33.6 34.2 35.1 39.7 39.3 35.8 34.5 39.5 36.9