Question: 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

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?

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