Just as for the mean and difference between means (see Problems 8.14, 9.4, and 9.5), a proportion or difference between proportions can be estimated by the use of a one-sided confidence interval. For...

Just as for the mean and difference between means (see Problems 8.14, 9.4, and 9.5), a proportion or difference between proportions can be estimated by the use of a one-sided confidence interval. For the data of Problem 9.6, find the minimum proportion of the graduate students who have an undergraduate degree in business, using a 90 percent confidence interval.