11.26 The Cost of Lumber, continued The analysis of variance F test in Exercise 11.17 (and data set EX1117) determined that there was indeed a differ- ence in the average cost of lumber for the four prov- inces. The following information from Exercise 11.17 is given in the table:

Use Tukey's method for paired comparisons to deter- mine which means differ significantly from the others at the a 0.01 level.

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Sample Means X-242.2 MSE 214.8 Error df X=231.6 n X-248.6 k: 41.25 16 5 4