TABLE 8.

Fixed and random effects for treatment comparison model

Fixed effects	Coefficient	SE	df	t Ratio
Posttest mean, γ00	0.884	0.035	20	25.47***
Treatment week 1 slope, γ01	0.175	0.066	20	2.66*
Treatment week 2 slope, γ02	0.230	0.066	20	3.50**
Pretest slope, γ10	0.160	0.032	489	4.96***
Quiz 1 slope, γ20	0.142	0.048	489	2.99**
Quiz 2 slope, γ30	0.109	0.037	489	2.94**

Random effects	Variance component	df	χ2	p Value
Posttest mean, u0	0.014	20	196.61	<0.001
Level 1, r	0.041

*p < 0.05.

**p < 0.01.

***p < 0.001.