Table 6 Mann–Whitney U test for the experimental and control groups’ scores in the achievement test
From: Online self-evaluation: the EFL writing skills in focus
Group | N | Mean | SD | Mean rank | Sum of ranks | Mann–Whitney U | Asymp. Sig. (2-tailed) | Z | Effect size |
|---|---|---|---|---|---|---|---|---|---|
Control group | 30 | 41.60 | 6.631 | 25.08 | 752.50 | ||||
Experimental group | 30 | 45.50 | 3.665 | 35.92 | 1077.50 | 287.500 | .016 | − 2.413- | 0.31 |
Overall | 60 |