Obtain a 95% CI for 1 2 using the data in Exercise 27. Is

Obtain a 95% CI for µ₁ − µ₂ using the data in Exercise 27. Is your interval consistent with the result of the hypothesis test in that exercise?

Data From Exercise 27

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A modification has been made to one assembly line for a particular automobile chassis. Because the modification involves extra cost, it will be implemented throughout all lines only if sample data strongly indicates that the modification has decreased true average assembly time by more than 1 h. Assuming that the assembly time distributions differ only with respect to location if at all, use the Wilcoxon rank- sum test at level .05 on the accompanying data (also in hours) to test the appropriate hypotheses. Original process 8.6 5.1 4.5 5.4 6.3 6.6 5.7 8.5 Modified process 5.5 4.0 3.8 6.0 5.8 4.9 7.0 5.7