A market research study was conducted to compare three different brands of antiperspirant. The results of the study are summarized below. Use a 5% level of significance and test the claim that opinion is independent of brand. Use these data to answer questions 12 and 13. Brand Opinion A B C Total Excellent 29 37 50 116 Satisfactory 83 65 83 231 Unsatisfactory 18 9 6 33 Total 130 111 139 380 What is the value of the sample test statistic? O x2 = 19.00 O x2 = 9.49 OF = 0.10 O x2 = 11.91