EXAMPLE 14.22 A Statistic to Compare Two Means

CASE 14.2 Refer to Figures 14.11 and 14.14 (pages 734 and 735). There are three pairs of population means. We can compare Groups 1 and 2, Groups 1 and 3, and Groups 2 and 3. For each of these pairs, we can write a statistic for the difference in means. To compare Basal with DRTA (1 with 2), we compute

The subscripts on specify which groups are compared.