EXAMPLE 14.23 Which Means Differ?

CASE 14.2 We apply the Bonferroni multiple-comparisons procedure with to the data from the new-product evaluation study in Example 14.15 (pages 734–735). The value of for this procedure (from software or special tables) is 2.46. The statistic for comparing Basal with DRTA is . Because is greater than 2.46, the value of , we conclude that the DRTA method produces higher reading comprehension scores than Basal.