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

Table 3

Results of an independent means t-test comparing the experimental and control groups’ chemistry retention test scores (N = 128).

Test	Groups	N	df	Mean	SD	t-cal	t-cr	p-Value	α -Value	Cohen’s d
Retention test	Experimental	64	63	54.31	13.116	4.167	1.660	0.000	0.05	0.12
	Control	64	63	44.70	12.972

Mean difference is significant at .