Purchase Solution

# Confidence Interval for Customer Satisfaction and Testing

Not what you're looking for?

Quality Progress, February 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 on a scale from 1 to10 to the question:

Considering all the business you do with Bank of America, what is your overall satisfaction with Bank of America? 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 percent confidence interval for the true proportion of all current Bank of America customers who would respond with a 9 or 10. Are we 95 percent confident that this proportion exceeds .48, the historical proportion of customer delight for Bank of America?

##### Solution Summary

The solution determines the confidence interval for customer satisfaction and testing.

##### Solution Preview

a) Given the sample size n = 350, the number of customers responded 9 or 10 X = 195. Hence the sample proportion (See attached) = 0.5571

95% confidence interval for the true ...

##### Free BrainMass Quizzes

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.