Chapter 21, Problem 3E

SECTION 18.2

3. Cars and trucks We have data on the city and highway fuel efficiency of 633 cars and trucks.

1. a) Would it be appropriate to use paired t methods to compare the city fuel efficiency of the cars and the trucks?
2. b) Would it be appropriate to use paired t methods to compare the city and highway fuel efficiencies of these vehicles?
3. c) A histogram of the differences (highway – city) is shown. Are the conditions for inference satisfied?