Question: A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to send a

A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to send a letter (costing about $0.45) asking the customer to pay. That worked 30% of the time. The bank wants to test a new method that involves sending a DVD to customers encouraging them to contact the bank and setup a payment plan. Developing and sending the video costs about $10 per customer. What is the parameter of interest? What are the null and alternate hypotheses?

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