Group N Mean SBS (MPa) Standard Deviation Standard Error 95% Confidence interval 1A   manufacturer protocol 20 33.24 5.67 1.27 30.59-35.89 1B  thin adhesive layer    20 24.07 7.04 1.57 20.78-27.36 1C  thick adhesive layer 20 20.95 6.41 1.43 17.95-23.94

Table 1: Descriptive Statistics Part 1.