The data shown in the accompanying table give measures of bending stiffness and twisting stiffness as determined by engineering tests on 12 tennis racquets.

a. Calculate the rank correlation coefficient rs between bending stiffness and twisting stiffness.
b. If a racquet has bending stiffness, is it also likely to have twisting stiffness? Use the rank correlation coefficient to determine whether there is a significant positive relationship between bending stiffness and twisting stiffness. Use α = .05.

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0 Twi Sit-zzi zzi 200 011 102 004 201 194 198 125 35 25 gs 19 07 63 60 57 22 24 59 46 56 74 41 BS-44332643 123456789112