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Problem 3. (20 points.) A trip generation model has the following formula for zone trip productions: P = 0.20 + (2.4 x 107) + 0.40n + 0.10ne , where P is total household productions, J the household income, n the total household size, and ng the number of children. Consider a zone with 14,000 households, an average household income of $60,000, and an average household size of 3.1 members, 1.2 of which are children. (a) (5) Calculate the total number of trips produced by this zone. a (b) (5) How much would household income need to rise for a household to increase its trip productions by 0.3? (c) (5) How many children would have to be added to a household to increase its trip productions by 1? (d) (5) If the P value on the regression coefficient for J is 0.07, and we only want to include variables that are significant at the 5% level, do we leave this variable in the final regression or remove it