22. The nutritive value of a certain edible fruit was measured in a total of 72 specimens representing 6 specimens of each of four varieties grown in each of the three geographic regions. The results were as follows.

Variety Geographic Region 6.9 11.0 13.1 13.4 11.8 7.8 12.1 14.1 6.2 7.3 9.9 13.5 A 9.2 9.1 12.4 13.0 9.2 7.9 11.3 12.3 6.2 6.9 11.0 13.7 8.9 5.8 12.1 9.1 9.2 5.1 7.1 13.1 5.2 5.0 13.0 13.2 B 7.7 9.4 13.7 8.6 7.8 8.3 12.9 9.8 5.7 5.7 7.5 9.9 6.8 7.8 8.7 11.8 5.2 6.5 10.5 13.5 5.0 7.0 10.0 14.0 C 5.2 9.3 8.1 10.8 5.5 6.6 10.6 12.3 7.3 10.8 10.5 14.0 Test for a difference among varieties, a difference among regions, and interaction. Let a = .05 for all tests.