Compute the standardized test statistic, X2, to test the claim o2 = 21.5 ifn = 12, s2 = 18, and a = 0.05. As part of a marketing experiment, a department store regularly mailed discount coupons to 25 of its credit card holders. Their 29 . total credit card purchases over the next three months were compared to the credit card purchases over the next three months for 25 credit card holders who were not sent discount coupons. Determine whether the samples are dependent or independent. O A. 9.209 O B. 0.492 O dependent O C. 12.961 O independent O D. 18.490 Classify the two given samples as independent or dependent. 30. Find the standardized test statistic to test the claim that , > H2. Two samples are randomly selected from each population. The sample statistics are given below. Sample 1: Pre-training weights of 27 people Sample 2: Post-training weights of 27 people n1 = 100, n2 = 125, X1 = 660, X2 = 645, 61 = 45, 62 = 25 28 O A. 2.99 O dependent OB. 1.86 O independent O C. 0.91 O D. 2.81