The market research department for a large department store conducted a survey of credit card customers to determine whether they thought that buying with a credit card was quicker than paying cash....

The market research department for a large department store conducted a survey of credit card customers to determine whether they thought that buying with a credit card was quicker than paying cash. The customers were from three different metropolitan areas. The results are given in Table 12.18. Test the hypothesis that there is no difference in proportions of ratings among the three cities.