According to the sixth annual survey of advertising agency employees conducted by Altschuler, Melvoin 3: lElasser, these employees can look forward to another excellent year for their compensation [Adveertising Age, December 1r 199?]. To investigate whether there is any difference in the annual compensation of artistic directors; suppose that a random sample of 10 of them is selected from each of four regions: West; South, North and Northeast, and that the investigation is desired 1.rvith a 13 'E- margin of error. Perform the analysis required forthe study. The base salary [in thousands of dollars] for each of the individuals: WEEt South North Northeast