The service time in queues should not have a large variance; otherwise, the queue tends to build up. A bank regularly checks service time by its tellers to determine its variance. A random sample of 22 service times (in minutes) gives s2 = 8. Give a 95% confidence interval for the variance of service time at the bank.
Answer to relevant QuestionsA sensitive measuring device should not have a large variance in the errors of measurements it makes. A random sample of 41 measurement errors gives s2 = 102. Give a 99% confidence interval for the variance of measurement ...In problem 6–27, give a 95% confidence interval for the variance of the transit time for all goods. In problem A transportation company wants to estimate the average length of time goods are in transit across the country. ...Find the minimum required sample size for estimating the average number of designer shirts sold per day to within 10 units with 90% confidence if the standard deviation of the number of shirts sold per day is about 50. According to the Wall Street Journal, an average of 44 tons of carbon dioxide will be saved per year if new, more efficient lamps are used. Assume that this average is based on a random sample of 15 test runs of the new ...Fifty years after the birth of duty-free shopping at international airports and border-crossing facilities, the European commission announced plans to end this form of business. A study by Cranfield University was carried ...
Post your question