For Exercises 14.1 and 14.2, see pages 717718; for 14.3 and 14.4, see page 720; for 14.5 and 14.6, see page 722; for 14.7, see page 724; for 14.8 and 14.9, see page 726; for 14.10 to 14.13, see pages 728728; for 14.14 and 14.15, see page 731; for 14.16 to 14.19, see page 739; for 14.20 and 14.21, see page 740; for 14.22 and 14.23, see page 741; for 14.24 and 14.25, see page 742; for 14.26 and 14.27, see page 743; for 14.28 and 14.29, see page 744; and for 14.30 and 14.31, see page 748.

Question 14.26

14.26 Which means differ significantly?

Here is a table of means for a one-way ANOVA with four groups:

Group
Group 1 128.4 9.8 20
Group 2 147.8 13.5 20
Group 3 151.3 15.3 20
Group 4 131.5 11.5 20

According to the Bonferroni multiple-comparisons procedure with , the means for the following pairs of groups do not differ significantly: 1 and 4, 2 and 3. Mark the means of each pair of groups that do not differ significantly with the same letter. Summarize the results.