15 Mark Schwinn and Jennifer Grier were resident advisors assigned to the first coed hall at Montana College. A welcome party was scheduled to take place the weekend after classes started, and the RAS had the responsibility of ordering the soft drinks. They couldn't, however, agree on kinds of soft drinks they should order (diet cola vs. regular cola vs. other assorted flavors). A total of 30-40 cases was to be ordered, and any unopened cans could be returned. Mark wanted 16 cases of regular cola, 6 diet cola, 6 regular noncola, and 2 diet noncola. Jennifer wanted to order. respectively. 11. 6. 9, and 4 cases. To avoid running out of anything, they decided to get the highest estimate of each kind, making a 35-case order (16 cases regular cola. 6 diet cola, 9 regular noncola, and 4 diet noncola). The actual consumption at the party was 12 cases of regular cola, 4 diet cola, 8 regular noncola, and 1 diet noncola Questions:

(a) Is there a difference in preferences between regular vs. diet pop? Cola vs. noncolas? Are the two variables independent?\