Consider again the one-way ANOVA hypothesis test described in Problem 11. Suppose that we are interested in comparing the mean sales achieved by salespeople with varying compensation schemes. In other words, we are interested in making all possible comparisons at this point. Recall that the relevant data are provided in the file P12_11.XLS. a Which method for generating confidence intervals for mean differences is most appropriate in this situation? Explain your choice. b Apply the method identified in part a to estimate the mean differences of interest. Briefly interpret your findings.

Data from in Problem 11

A company that employs a large number of salespeople is interested in determining which of the following subsets of the sales staff sells, on average, the most: (1) those whose compensation consists of a fixed salary, (2) those whose compensation is based strictly on commission, and (3) those whose compensation is based on a smaller fixed portion and a reduced commission rate. Sales data (in dollars) from the previous quarter are collected for randomly selected salespeople who are compensated according to one of the three aforementioned schemes. The data are given in the file P12_11.XLS.