Table 3. Sum of squares for the sources of variation in the analysis of variance model.

Origin	df	Attention	Clarity	Repair	PEI
Corrected Model	6	1073.22	838.67	438.74	3693.22
Intercept	1	229960.87	275653.11	294560.43	2394147.66
Sex	1	3.44	14.91	3.10	.059
Age	3	568.87*	584.56*	344.07*	1472.74
Mastery	2	541.39*	207.15*	97.280	2210.82*
Error	1511	59310.53	52230.28	49873.11	309081.72
Total	1,518	1,274,641.00	1,522,426.00	1,600,331.00	12,979,978.00
Corrected Total	1,517	60,383.76	53,068.962	50,311.864	312,774.954