Changes in credit card usage by undergraduates. In Exercise 8.30 (page 470) we looked at data from a survey of 1430 undergraduate students and their credit card use. These students were surveyed 2004. In the sample, 43% said that they had four or more credit cards. A similar study performed in 2000 by the same organization reported that 32% of the sample said that they had four or more credit cards.26 Assume that the sample sizes for the two studies are the same. Find a 95% confidence interval for the change from 2000 to 2004 in the percent of undergraduates who report having four or more credit cards.