Table 6: Model development versus items.
(a)

Regression statistics

Multiple R 0.4817
R Square0.2320
Adjusted R square0.2046
Standard error22.5342
Observations88.0000

(b)

ANOVA
dfSSMSFSignificance F

Regression3.000012886.41524295.47178.45920.0001
Residual84.000042654.2098507.7882

Total87.000055540.6250

(c)

CoefficientsStandard errort statP value

Intercept14.035111.71831.19770.2344
Arith Manip1.08780.27413.96890.0002
Algebra0.87360.25043.48860.0008
ManipXAlg−0.01530.0047−3.23450.0017