Suppose ?1 and ?2 aretrue mean stopping distances at 50 mph for cars of a certain typeequipped with two different types of braking systems. The datafollows: m = 8,x = 115.8, s1= 5.06, n = 8, y = 129.5, ands2 = 5.35. Calculate a 95% CI for thedifference between true average stopping distances for carsequipped with system 1 and cars equipped with system 2. (Round youranswers to two decimal places.)
