Table 3. Mean scores of experimental and control groups in SCM exams

		N	Mean	SD	SE	95% confidence interval for mean		Min.	Max.
						Lower bound	Upper bound
SCM 1st exam	Experimental	23	21.34	3.51	.73	19.82	22.86	15.00	28.00
	Control	27	19.66	4.48	.86	17.89	21.43	10.00	28.00
	Total	50	20.44	4.11	.58	19.27	21.60	10.00	28.00
SCM 2nd exam	Experimental	23	20.04	5.04	1.05	17.86	22.22	11.00	29.00
	Control	27	23.40	5.67	1.09	21.16	25.65	7.00	29.00
	Total	50	21.86	5.60	.79	20.26	23.45	7.00	29.00
SCM final exam	Experimental	23	25.91	3.90	.81	24.22	27.60	16.00	30.00
	Control	27	22.66	4.56	.87	20.86	24.47	10.00	29.00
	Total	50	24.16	4.53	.64	22.87	25.44	10.00	30.00

Note. SCM, supply chain management.