A taxi company is trying to decide whether to purchase Brand A or Brand B tires for its fleet of taxis. To estimate the difference in the two brands, an experiment is conducted. In January 2019, Brand A tires were put on 8 taxis, and Brand B tires were put on 8 (different) taxis. The tires were used until they were worn out. The results were
Construct a 94% confidence interval for the difference between the average distance traveled before they were worn out. Assume normal populations.