The model testing path a (step 2) was significant,R2 =.71–.73,F(2,5883)=3033.03–3436.56,all ps<.01.For steps 1,3,and 4,a regression model3 that includes PS, RC,and Num2010 asa controlling variable,was found to be significant R2 =.42–.47,F(3,5882)=3955.73–4654.11,allps<.01.Table 9reports the pooled estimates for the regression models specified in steps 2 and 4.Computing the Sobel test statistic was done using software by Preacher and Leonardelli (2012).Testing if the indirect path,c0,is different from zero,the result is significant,z=6.96,SE=.01,p<.01.This confirms the results from the SEM approach and supports the interpretation that RC skill is a partial mediator of the relationship between PS ability and growth in maths achievement.The mediating effect is only partial since PS ability remains a significant predictor of maths growth even when RC skill was added to the regression model
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