Consider the following regression equation: Y= 44+ 18X₁ (3) (6) R² = 0.78; n = 40; d = 1.40. Where Y number of accidents; X number of cars; and the number in parenthesis is the standard error. a) Does autocorrelation exist at 5 percent level of significance? b) Is the autocorrelation positive or negative? c) Is X a significant determination of Y at the 10 percent level of significance?