Suppose that another bank branch, located in a residential area, is also concerned with the noon-to-l:00 p.m. lunch hour. The waiting time, in minutes, collected from a sample of 15 customers during this hour, are stored in Bank2:
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
a. Compute the mean and median.
b. Compute the variance, standard deviation, range, coefficient of variation, and Z scores. Are there any outliers? Explain.
c. Are the data skewed? If so, how?
d. As a customer walks into the branch office during the lunch hour, he asks the branch manager how long he can expect to wait. The branch manager replies, "Almost certainly less than five minutes." On the basis of the results of (a) through (c), evaluate the accuracy of this statement.