Question: Thinking about the data on fuel efficiency in Exercise 3, why is the blocking accomplished by a matched pairs analysis particularly important for a sample

Thinking about the data on fuel efficiency in Exercise 3, why is the blocking accomplished by a matched pair€™s analysis particularly important for a sample that has both cars and trucks?
In Exercise 3

220 100 60 20 30 -20 10 0 10 20 Difterence

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