1. The U.S. Department of Energy's Fuel Economy Guide provides fuel efficiency data for cars and trucks. A portion of the sample data for 311 compact, midsize, and large cars follow. The column labeled Class identifies the size of the car; Compact, Midsize, or Large. The column labeled Displacement shows the engine's displacement in liters. The column labeled Fuel Type shows whether the car uses premium (P) or regular (R) fuel, and the column labeled Hwy MPG shows the fuel efficiency rating for highway driving in terms of miles per gallon. A partial report of regression analysis is provided below. Answer the questions based on the report.

Car Class Displacement Fuel Type Hwy MPG Compact 3.1 25 W N - Compact 3.1 25 Compact 3 25 161 Midsize 2.4 * * ... 07 ... 070 30 162 Midsize 29 ww... N 310 Large 25 311 Large 25