Catherine Chao, Director of Marketing Research, is evaluating consumer acceptance of alternative toothpaste packages. She wonders whether acceptance is influenced by children in the household. Her staff prepared the following contingency table from a random sample of 100 households. Children in Household Pre- teenagers none teenagers Preferred Pump 30 20 10 Package Tube 10 10 20 Using a - .05, the observed value of chi-square is O 18.79 O 16.79 O 5.28 0 9.49 O 13.19