Abstract

An A4 100g/m² copy paper Multi-paper Fabriano was tested for its tensile strength in both directions MD (machine direction) and CD (cross direction). The mean value of the tensile strength MD 4.91KN/m was compared to the mean value of the tensile strength CD 3.28ΚΝ/m using one-sample T-test. The means of the two properties were found statistically significantly different from zero. The t_experimental=81.110 for MD tensile strength was greater than t_theoretical=2.262. Also, the t_experimental=43.540 for CD tensile strength was greater than t_theoretical=2.262, for 95% confidence interval and 9 degrees of freedom. The two means of tensile strength MD and CD were found not equal. The one-way ANOVA was also performed and compared the amount of variation between groups with the amount of variation within groups. The variance of among groups was greater than that of within groups, i.e., 13.350>0.456, and thus the null hypothesis was rejected that the means of tensile strength MD and CD were equal. The tests were performed at a significant level of p<0.05. Finally, the formula for simple linear regression was calculated to be y=0.37562094*x+ 1.432949943, whereas y was the dependent variable, the CD tensile strength and x was the independent variable, the MD tensile strength.

Keywords:A4 copy paper; Tensile strength; Machine direction; Cross direction; Compare means; One- Sample T-test; One-way ANOVA; Least-squares line; Null hypothesis; P-value