questionThe Texas Transportation Institute (tti.tamu.edu) studies traffic delays. They calculate that in the year 2011, 498 urban areas experienced $5.5$ billion in vehicle hours of delay, resulting in $2.9$ billion in gallons of wasted fuel and $\$ 121$ billion in lost productivity and fuel costs. That's about $0.7 \%$ of the nation's GDP that year. Data the institute published for the year 2001 includes information on the Total Delay per Person (hours per year spent delayed by traffic), the Average Arterial Road Speed (mph), the Average Highway Road Speed (mph), and the size of the city (small, medium, large, very large). The regression model based on these variables looks like this. The variables Small, Large, and Very Large are indicators constructed to be 1 for cities of the named size and 0 otherwise.
Dependent variable is: Delay/person
R-squared $=79.1 \%$ R-squared (adjusted) $=77.4 \%$
$s=6.474$ with $68-6=62$ degrees of freedom
$$
\begin{array}{lcrcc}\text { Source } & \text { Sum of Squares df Mean } & \text { Square } & \text { F-ratio } \\ \text { Regression } & 9808.23 & 5 & 1961.65 & 46.8 \\ \text { Residual } & 2598.64 & 62 & 41.9135 & \\ \text { Variable } & \text { Coeff } & \text { SE(Coeff) } & \text { t-ratio } & \text { P-value } \\ \text { Intercept } & 139.104 & 16.69 & 8.33 & <0.0001 \\ \text { HiWay MPH } & -1.07347 & 0.2474 & -4.34 & <0.0001 \\ \text { Arterial MPH } & -2.04836 & 0.6672 & -3.07 & 0.0032 \\ \text { Smal1 } & -3.58970 & 2.953 & -1.22 & 0.2287 \\ \text { Large } & 5.00967 & 2.104 & 2.38 & 0.0203 \\ \text { Very Large } & 3.41058 & 3.230 & 1.06 & 0.2951\end{array}
$$
b) Describe how the coefficients of Small, Large, and Very Large account for the size of the city in this model. 1st Edition•ISBN: 9780078953125 (1 more)Carl A. Woloszyk, Grady Kimbrell, Lois Schneider Farese1,600 solutions
10th Edition•ISBN: 9781337902571 (1 more)Eugene F. Brigham, Joel Houston777 solutions
14th Edition•ISBN: 9780470587232 (4 more)Donald E. Kieso, Jerry J. Weygandt, Terry D. Warfield1,471 solutions
6th Edition•ISBN: 9780078692512McGraw-Hill Education3,760 solutions