29.4 The test statistic: Mean differences

The sample mean difference can be located on the sampling distribution (Fig. 29.3) by computing the t-score:

t=0.5400.3212=1.681, following the ideas in Equation (27.1). Software computes the t-score too (jamovi: Fig. 29.4; SPSS: Fig. 29.5). The t-score places the observed sample statistic on the sampling distribution.