The Contribution of Using Cooperative Learning Methods on Students’ Achievement and Retention in Secondary Schools during Chemistry Lesson

Table 4

Paired sample t-test result of students’ chemistry knowledge retention after training for the treatment group (N = 64).

Tests	Mean	SD	95% confidence interval of the difference		t-Value	df	p-Value	Cohen’s d
			Lower	Upper
Pretest	28.30	5.705	−29.603	−23.272	−16.688	63	0.000	0.81
Retention test	53.84	10.756

Mean difference is significant at .