Random samples of two freshmen, two sophomores, two juniors, and two seniors each from four dormitories were asked to rate on a scale from 1 (poor) to 10 (excellent) the quality of the dormitory environment for studying. The results are shown in the table.

Year Dormitory A Dormitory B Dormitory C| Dormitory D 7 8 9 9 Freshman 5 6 8 6 Sophomore VUI UT 8 8 UT Junior 4 6 8 6 6 7 Senior 4 5 7 8