When Mr. Selig took over as president of Century several years ago, the use of debit cards was just beginning. The Excel file “banking” at the rEsource site contains the data. He would like an update on the use of these cards. Develop a 95 percent confidence interval for the proportion of customers using these cards. On the basis of the confidence interval, is it reasonable to conclude that more than half of the customers use a debit card? Interpret the results.
