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 operators differ?