The least-squares regression equation Å· = 98.1 + 5.0t has been fitted to the shipment data given here. Calculate the Durbin-Watson d statistic and test for positive autocorrelation of the residuals at the 0.05 level of significance. Comment on the appropriateness of using this model for this set of data.

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Yt Yt 97.06125.5 11 150.6 2 109.7 7 132.9 12 57.8 3 110.3 8 39.7 158.3 4 121.5 9 5.6 14 166.9 5 1304 10 49.4 15 175.8