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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