Question: Before launching its Buyers Assurance Program American Express wanted to
Before launching its Buyers' Assurance Program, American Express wanted to estimate the proportion of cardholders who would be interested in this automatic insurance coverage plan. A random sample of 250 American Express cardholders was selected and sent questionnaires. The results were that 121 people in the sample expressed interest in the plan. Give a 99% confidence interval for the proportion of all interested American Express cardholders.
Answer to relevant QuestionsAn airline wants to estimate the proportion of business passengers on a new route from New York to San Francisco. A random sample of 347 passengers on this route is selected, and 201 are found to be business travelers. Give ...A 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 6-5, suppose that a 99% confidence interval is required. Compute the new interval, and compare it with the 95% confidence interval you computed in problem 6-5. In problem A real estate agent needs to estimate the ...Landings and takeoffs at Schiphol, Holland, per month are (in 1,000s) as follows: 26, 19, 27, 30, 18, 17, 21, 28, 18, 26, 19, 20, 23, 18, 25, 29, 30, 26, 24, 22, 31, 18, 30, 19 Assume a random sample of months. Give a 95% ...Fin Aid is a new, free Web site that helps people obtain information on 180,000 college tuition aid awards. A random sample of 500 such awards revealed that 368 were granted for reasons other than financial need. They were ...
Post your question