A government agency wants to determine whether the average salaries of four various kinds of transportation operators differ. A random sample of five employees in each of the four categories yields the salary data given in the table below:

a. Construct an ANOVA table and estimate the p-value.
b. Specify the competing hypotheses in order to determine whether the average salaries of the transportation operators differ.
c. At the 5% significance level, can we conclude that the average salaries of the four transportation operatorsdiffer?

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Average Salaries of Transportation Operators ($1,000s) Locomotive Taxi and Engineer Truck Driver Bus Driver Limousine Driver 54.7 53.2 55.1 54.3 51.5 X1 53.76 40.5 42.7 41.6 40.9 39.2 40.98X3 31.22 32.4 31.2 30.9 31.8 29.8 26.8 27.1 28.3 27.9 29.9 石= 28.00 5149 2.10 s 1.69 0.96 Grand mean: X 38.49