Impacts of computer-assisted diagnostic assessment on sustainability of L2 learners’ collaborative writing improvement and their engagement modes

Table 5 Descriptive statistics: pretest, the immediate and delayed posttest scores

Test	N	Mean	Std. deviation	Std. error	95% confidence interval for mean
Test	N	Mean	Std. deviation	Std. error	Lower bound	Upper bound
Pretest	36	14.19	1.650	.266	12.45	17.03
Immediate Posttest	36	25.11	1.514	.273	22.98	27.11
Delayed Posttest	36	24.65	1.559	.329	22.09	27.81