Bonferronis procedure is used to compare the mean distances of the four golf ball brands in Example
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Bonferroni’s procedure is used to compare the mean distances of the four golf ball brands in Example 10.8. The resulting confidence intervals, with an experimentwise LO4 error rate (EER) of a = .05, are shown in the SPSS printout of Figure 10.23. Interpret the results.
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(I) BRAND (J) BRAND Multiple Comparisons DISTANCE Bonferroni 95% Confidence Interval Mean Difference (I- J) Std. Error Sig. Lower Bound Upper Bound A B -6.1300 2.01222 .031 -11.8586 -.4014 -18.2800* 2.01222 .000 -24.0086 -12.5514 D 6.3200* 2.01222 .024 .5914 12.0486 B A 6.1300 2.01222 .031 .4014 11.8586 C -12.1500* 2.01222 .000 -17.8786 -6.4214 D 12.4500* 2.01222 .000 6.7214 18.1786 A 18.2800 2.01222 .000 12.5514 24.0086 B 12.1500" 2.01222 .000 6.4214 17.8786 D 24.6000* 2.01222 .000 18.8714 30.3286 D A -6.3200* 2.01222 .024 -12.0486 -.5914 B -12.4500* 2.01222 .000 -18.1786 -6.7214 -24.6000* 2.01222 .000 -30.3286 -18.8714 Based on observed means. The error term is Mean Square (Error) = 20.245. *. The mean difference is significant at the 0.05 level.
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