Using the computer output, perform pairwise comparisons of the treatment means in Exercise 11.8 by (1) Using Tukey simultaneous 95 percent confidence intervals (2) Optionally using t statistics and critical values ( see the right side of Figure 11.6 and page 416). Which brands are most durable? Find and interpret a 95 percent confidence interval for each of the treatment means.

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SUMMARY Groups Count Sum Average Varlance Alpha Best Century Divot Tukev simultaneous comparison t-values (d.f. 16) Century Alpha Best Divot 306.4 336.6 5 1268 253.6 5 1532 306.4 740.3 5 1209 241.8 49.7 5 1683 336.6 609.3 Century 241.8 Alpha 253.6 331 5.33 Best 306.4 605.3 336.6 -6,09 6.09 1.94 Critical values for experimentwise error rate: 2.86 3.67 ANOVA Source of Varlation S df Between Groups 29860.4 3 9953.466716.420798 3.853E-05 3.2388715 Within Groups Total F P-Value 0.05 0.01 MS F crit 9698.4 16 606.15 39558.8 19