A political science professor is interested in finding out whether there is a relation between political affiliation and attitude towards a recent supreme court ruling about challenges to federal affirmative-action programs. He samples a group of registered voters at a random and organizes the data obtained in the contingency table below. According to this information, what can he conclude about the relationship he is interested in studying?
Attitude towards the ruling .
Political affiliation Approval Do not approve Not sure Total
Democrats 10 15 5 30
Republicans 15 15 10 40
Independent 6 4 5 15
TOTAL 31 34 20 85