Source Coefficient Estimate Sum of squares Df F-value P-value Prob>F
Intercept(β0) 111.03        
Model   3154.80 5 36.17 <0.0001*
X11) 6.67 266.67 1 15.28 <0.0058*
X22) 20.00 2400.00 1 137.56 <0.0001*
X1 X23) 2.50 25.00 1 1.43 0.2702**
X124) 1.38 5.25 1 0.30 0.6002**
X225) 11.38 357.64 1 20.50 0.0027*
*Significant; ** not significant; lack of fit is not significant at P value >0.0
Table 2: ANOVA of drying time for infrared dried tomato slices by response surface quadratic model.