17. Tennis, Anyone? Tennis racquets vary in their physical characteristics. The data in the accompanying table give measures of bending stiffness and twisting stiffness as measured by engineering tests for 12 tennis racquets:

a. If a racquet has bending stiffness, is it also likely to have twisting stiffness? Do the data provide evidence that x and y are positively correlated?

b. Calculate the coefficient of determination r2 and interpret its value

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Bending Racquet Stiffness, x Twisting Stiffness, y 123456 419 227 407 231 363 200 360 211 257 182 622 304 7 424 384 8 359 194 9 346 158 10 556 225 11 474 305 12 441 235