Following customer complaints about the quality of service, Dell stopped routing corporate customers to a technical support call center in Bangalore, India (USA Today, November 24, 2003). Suppose Dell's decision to direct customers to call centers outside of India was based on consumer complaints in the last six months. Let the number of complaints per month for 80 randomly selected customers be given below.

a. Construct the centerline and the upper and lower control limits for the p̅ chart if management allows a 15% complaint rate.

b. Can you justify Dell's decision to direct customers to call centers outside of India?

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Month Number of Complaints 1 20 12 3 24 14 25 6 22