61. Physical properties of six ame-retardant fabric samples were investigated in the article Sensory and Physical Properties of Inherently Flame-

Retardant Fabrics (Textile Res., 1984: 61—68). Use the accompanying data and a .05 signi cance level to determine whether there is a signi cant correlation between stiffness x (mg-cm) and thickness y

(mm). Is the result of the test surprising in light of the value of r?

x 7.98 24.52 12.47 6.92 24.11 35.71 y .28 .65 .32 .27 .81 .57