An investigator collects the following data on variables A and B, using a two-way independent groups design. Use a = 0.05 in analyzing the data. Variable B Variable A (1) (2) (3 10 13 15 12 15 19 (1) 14 17 20 18 22 25 17 16 19 15 18 26 17 19 30 (2) 19 22 31 23 27 36 20 21 29 Forit for the A variable equals O a. 3.40 O b. 7.82 O c. 5.81 O d. 4.26