A bank with a branch located in a commercial district of a city has developed an improved process for serving customers during the noon-to-1 P.M. lunch period. The bank has the business objective of reducing the waiting time (defined as the time elapsed from when the customer enters the line until he or she reaches the teller window) to increase customer satisfaction. A random sample of 15 customers is selected (and stored in Bank 1); the results (in minutes) are as follows:

Another branch, located in a residential area, is also concerned with the noon-to-1 P.M. lunch period. A random sample of 15 customers is selected (and stored in the file Bank 2); the results (in minutes) are as follows:

a. Is there evidence of a difference in the median waiting time between the two branches? (Use α = 0.05.)
b. What assumptions must you make in (a)?
c. Compare the results (a) with those of Problem 10.12 (a) on page 376. Discuss.

Transcribed Image Text:

4.21 5.55 3.02 5.13 4.77 2.34 3.54 3.20 4.50 6.10 0.38 5.12 6.46 6.19 3.79 9.66 5.90 8.02 5.79 8.73 3.82 8.01 8.35 10.49 6.68 5.64 4.08 6.17 9.91 5.47