2-11. Two middle-school teachers were asked to rate N = 10 different essays on the basis of clarity of presentation. They were asked to assign grades of A, B, C, D, or F to each essay, with A being the highest grade and F considered failing. Is there a substantial amount of agreement between the grading standards of these teachers?

Judge 1 Grades Judge 2 Grades Essay Xi Yi 1 D C 2 D D 3 F D 4 D F 5 A B 6 B A 7 A B 8 C B 9 B C 10 C C