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

Table 1

Results of an independent means t-test comparing the posttest results for students in the control and experimental groups (N = 128).

Test	Groups	N	df	Mean	SD	t-cal	t-cr	p-Value	α-Value	Cohen’s d
Posttest	Experimental	64	63	70.30	10.471	5.544	1.660	0.000	0.05	0.196
	Control	64	63	60.34	9.832	—	—	—	—	—

Mean difference is significant at