If you play tennis, you know that 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 Twisting Racquet Stiffness, x Stiffness, y 419 407 363 360 257 622 424 359 346 556 474 441 227 231 200 211 182 304 384 194 158 225 305 235 10 12