We have data on the city and highway fuel efficiency of 316 cars and 316 trucks.

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

Transcribed Image Text:

220 180 100 60 2아- -30 -20 10 0 10 20 Difference