Find historical proportion of customer delight for b of a

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Feb; 2005 reports on the results achieved by Bank of America in improving customer satisfaction and customer loyalty by listening to the voice of the customer. A key measure of customer satisfaction is the response of a scale from 1-10 to the question: considering all the business you do with B. of American. What is your overall satisfaction with B of A. ? Suppose that a random sample of 350 current customers results in 195 customers with a response of 9 or 10 representing customer delight, find a 95 % confidence interval for the true proportion of all current B of A customers who would respond with a 9 or 10. Are we 95 % confident that this proportion exceeds .48 the historical proportion of customer delight for B of A?

Reference no: EM13136594

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