The least-squares regression equation Å· = 15.2 + 10.7t has been fitted to the shipment data in the table. Calculate the Durbin-Watson d statistic and test for positive autocorrelation of the residuals at the 0.05 level of significance. Based on your conclusion, comment on the appropriateness of using this model for this set of data.

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Yt 68.3 13 141.3 2 56.7 8 7. 14 149.6 3 79.5 9 104.2 15 177.1 4 534 10 04.2 16 193.6 5 59.7 15.4 17 238.9 86.6 18 259.2 65.6 2 2 6 71 12