A government agency wants to determine whether the average salaries of four kinds of transportation operators differ.

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A government agency wants to determine whether the average salaries of four kinds of transportation operators differ. The accompanying table shows the salaries (in $1,000s) for a random sample of five employees in each of the four categories. Assume that salaries are normally distributed.

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a. Specify the competing hypotheses in order to determine whether the average salaries of the transportation operators differ.

b. At the 5% significance level, what is the conclusion to the test?

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