Table 5.

Regression model: contribution to math achievement.

Variable	Unstandardized b	Standardized β	Standard error	t
Constant	39.82***		4.62	8.62
Math interest	3.20**	0.20**	1.20	2.67
Gender	−3.85*	−0.17*	1.63	−2.37
SmallN	−2.80	−0.14	1.72	−1.63
2DlargeN	−0.231	−0.01	2.40	−0.10
Mix	−0.12	−0.01	1.79	−0.07
3DlargeN	1.22	0.04	2.39	−1.63
R2	0.09
Adjusted R2	0.06
F(df = 6, 178)	2.87*

^*p < 0.05; ^**p < 0.01; ^***p < 0.001.