Straight confidence bands

The confidence band, CB, of the entire calibration straight line as shown in Fig. 6.7 is given by... 

Fig. 6.7. Calibration straight line with relevant upper and lower confidence and prediction bands...

The time dependence of the strain at break is very different for the two types of sealant. The break points of the silicone data can be fitted by a straight line, and confidence limits at various levels can be drawn on the plot (Figure 11). The break points of the two-part polysulfide sealant form a broad band, the upper and lower limits of which are drawn qualitatively. The upper limit is better defined than the lower one (as for the failure envelope). Because of the difference between the plots for silicone and polysulfide sealants the further simplification of characterization is different for the two types of sealant. 

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