Physical properties of six flame-retardant fabric samples were investigated in the artic...

Physical properties of six flame-retardant fabric samples were investigated in the article “Sensory and Physical Properties of Inherently Flame-Retardant Fabrics” (Textile Research, 1984: 61–68). Use the accompanying data and a .05 significance level to determine whether a linear relationship exists between stiffness x (mg-cm) and thickness y (mm). Is the result of the test surprising in light of the value of r?