When customers call a credit card provider, it is common practice to survey a sample of customers to ask them about their experience. Suppose that a particular company has surveyed customers who have made recent calls. Among other things, the survey asked customers about the main purpose for their call. The purposes can broadly be grouped into the following five categories: Current Balance Inquiry (including remaining credit limit), Payment Inquiry (due date, minimum payment, etc.), Recent Transactions Inquiry, Billing Inquiry (interest rate, disputes, etc.) and Rewards Inquiry. The company also asks customers to rate their satisfaction on various dimensions, including satisfaction with the information that they received and with the demeanor of the service provider. Satisfaction level is measured on a scale from 1 to 5, where 1 is the least satisfied and 5 is the most. The company is particularly interested to know if the levels of satisfaction vary by purpose of call. The "Credit Card" worksheet in the file