You are interested in the effect rainfall has on the number of traffic accidents in your city. You consider 4 possible specifications for a polynomial regression: (1) Accidents = 15.2 + 0.23*Rain - 0.11*Rain + 0.08*Rain 3 - 0.05*Rain (7.1) (0.13) (0.05) (0.03) (0.02) (2) Accidents = 13.2 + 0.14*Rain - 0.09*Rain + 0.07*Rain (5.1) (0.05) (0.03) (0.04) (3) Accidents = 7.5 + 0.24*Rain - 0.13*Rain- (3.6) (0.12) (0.07) (4) Accidents = 9.4 + 0.18*Rain (2.3) (0.05) Based on a 5% significance level, which of the 4 specifications is the most appropriate model? OSpecification 1 OSpecification 2 OSpecification 3 OSpecification 4 ONone of them since Rain does not have a statistically significant effect on Accidents