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 using 14 of each...

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 using 14 of each brand. The tires are run until they wear out. The results are given in the table below. Compute a 90​% confidence interval for μA−μB assuming the populations to be approximately normally distributed. You may not assume that the variances are equal.