Table 4: ANOVA for response surface quadratic model of flexural strength.

SourceSum of squaresDfMean square value value

Model2228.039247.5611.720.0072
X1-pressure323.221323.2215.300.0113
X2-temp.117.731117.735.570.0647
X3-time60.50160.502.860.1514
X1X2 96.63196.634.570.0855
X1X34.7714.770.230.6545
X2X3176.231176.238.340.0343
X12449.011449.0121.250.0058
X22408.051408.0519.320.0071
X32518.051518.0524.520.0043
Residual105.62524.52
Lack of fit105.62321.12
Pure error0.000235.21
Cor. total2333.65140.000