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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?
What is the probability that a randomly selected automobile manufactured by the company will have a defective microprocessor?
The ages of U.S. aircraft have a mean of 13.0 years and a standard deviation of 7.9 years. If the Federal Aviation Administration randomly selects 35 commercial aircraft for special stress tests, find the probability that the mean age of this samp..
Find a 98% confidence interval for the true mean. Assume that the account balances are normally distributed.
A study of injuries to in line skaters used data from the National Electronic Injury Surveillance System, which collects data from a random sample of hospital emergency rooms.
Find out the range of the following set of whole numbers: 12, 13, 15, 17, 12, 18, 12, 19, 13, 12, 14, 13, 12, 15
The formula for the ratio is the mileage that 14 students drive to work out of 20 students. Compute the central tendency (mean, median, mode) and dispersion (range, variance, standard deviation).
A random sample of 90 printers discovered that 25 of them were being used in small businesses. Find the 95% limit for the population proportion of printers that are used in small buisnesses.
An elementary school principal would like to know how many hours the students spend watching TV each day. A sample of n = 25 children is selected, and a survey is sent to each child's parents.
She then uses the mean and standard deviation of these values to estimate the mean value for all parts the operator is making. Construct a 95% confidence interval for the mean value assuming a normal distribution.
Age effects in medical care. The type of medical care a patient receives may vary with the age of the patient. A large study of women who had a breast lump investigated whether or not each woman received a mammogram and a biopsy when the lump was ..
What quantitative method can be applied to help the Department make the decision? Outline how this method can be applied and explain how a qualitative method can also be applied to help the Department make the decision
Suppose that the mean amount wagered by all patrons is $287 with a standard deviation of $15. You should give free accomodations to those individuals who wager over how much money?
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