Question: A political party suspects there are differences in Presidential candidate preferences based on age. A nationwide survey was conducted with 500 registered voters selected at random in each of four age groups (30 & under, 31-50, 51-70, over 70). All survey respondents indicated their preference rankings (1, 2, 3) for the party's three leading candidates. To test differences in voting preferences, a significance level of .05 is desired. What test(s) would you recommend?