Table 1.

Means and standard deviations of age, GPA and pre-test scores of the experimental and control groups

Variable	Control	Experimental	t	p
Age	20.53±0.97	20.91±0.99	1.490	0.141
GPA	16.15±1.70	16.37±0.98	0.625	0.534
Pre-test	12.77±1.61	13.69±3.58	1.289	0.202
Post-test	33.40±5.48	38.22±5.48	3.46	0.001
Differences of pre- & post-test	20.63±5.58	24.53±5.74	2.71	0.009