Posted by **Student** on Wednesday, August 13, 2008 at 3:58pm.

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 waiting time (operationally defined as the time elapsed from when the customer enters the line until he or she reaches the teller window) of all customers during this hour is recorded over a period of one week. A random sample of 15 customers is selected (and stored in the file bank1.xls), and the results (in minutes) are as follows: 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 Suppose that 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 bank2.xls), and the results are as follows: 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 Assuming that the population variances from both banks are not equal, is there evidence of a difference in the mean waiting time between the two branches? (Use 0.05 level of significance )

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**lala**, Monday, May 16, 2011 at 12:19pm
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