TABLE 2.

Within-group and between-group mean differences and effect sizes for the Academic Goals Questionnaire (AGQ), experimental and control groups.

	Experimental group (N = 320)							Control group (N = 121)							Control/experimental group
	Pretest		Posttest		Within-group			Pretest		Posttest		Within-group			Between-group pretest			Between-group posttest
AGQ	M	SD	M	SD	t	p	d	M	SD	M	SD	t	p	d	t	p	g	t	p	g
Learning goals	30.41	4.60	31.92	4.73	−7.558	<001	0.32	30.05	5.17	28.93	5.24	7.558	<001	0.22	−0.695	0.487	0.07	−5.925	<001	0.61
Social reinforcement goals	9.60	3.21	9.83	3.84	−1.360	0.175	0.06	9.04	3.18	10.17	3.43	−2.821	0.006	0.34	−1.677	0.094	0.18	0.826	0.386	0.09
Achievement goals	27.09	3.29	27.23	3.42	−0.753	0.452	0.04	26.76	3.52	26.08	3.46	4.532	<001	0.19	−0.922	0.357	0.10	−3.197	0.001	0.33