Do heavier cars really use more gasoline? Suppose a car is chosen at random. Let x be the weight of the car (in hundreds of pounds), and let y be the miles per gallon (mpg). x 29 44 29 47 23 40 34 52 y 32 21 22 13 29 17 21 14   a) Verify the given sums Σx, Σy, Σx2, Σy2, Σxy, and the value of the sample correlation coefficient r. (Round your value for r to four decimal places.) Σx = 298. Complete the following: Σy = Σx2 = Σy2 = Σxy = r =

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