Suppose 𝜇1 and 𝜇2 are true mean stopping distances at 50 mph for cars of a certain type equipped with two different types of braking systems. The data follows: m = 8, x = 115.8, s1 = 5.09, n = 8, y = 129.6, and s2 = 5.36.
Calculate a 95% CI for the difference between true average stopping distances for cars equipped with system 1 and cars equipped with system 2. (Use
𝜇1 − 𝜇2.
Enter your answer using interval notation. Round your numerical values to two decimal places.)
Does the interval suggest that precise information about the value of this difference is available?
Because the interval is so narrow, it appears that precise information is available.Because the interval is so wide, it appears that precise information is not available. Because the interval is so wide, it appears that precise information is available.Because the interval is so narrow, it appears that precise information is not available.