A problem that prevents a customer from receiving or making phone calls is upsetting to both the customer and the company that provides the phone service. The file Phone contains samples of 20 problems reported to two different offices of a phone provider and the time (minutes) to clear these problems:

a. Is there evidence of a difference in the median time to clear problems between offices? (Use a = 0.05.)
b. What assumptions must you make in (a)?
c. Compare the results of (a) with those of Problem 10.9(a) on page 316.

Office I Time to Clear Problems (Minutes) 48 1.75 0.78 2.85 052 1.60 4.15 3.97 148 3.10 1.02 0.53 093 1.60 0.80 1.05 6.32 3.93 5.45 0.97 Office II Time to Clear Problems (Minutes) 7.55 3.75 0.10 1.10 0.60 0.52 3.30 2.10 0.58 4.02 3.75 0.65 1.92 0.60 153 4.23 0.08 148 1.65 0.72