13.37 A farmer’s yearly yield is based on the amount of rainfall received in a year and average temperature during the year. A series of observations over the past 15 years was obtained, and the model yielded the following results:

Yieldt = 0.767 + 0.3543 * rainfallt + 0.7294 * tempt R2 = 0.873, d = 0.726 Does it show any positive autocorrelation in the error terms at 5% significance level?