15.50 Student Ratings A school principal suspected that a teacher's attitude toward a Grade 1 student depended on his original judgment of the child's ability. The principal also suspected that much of that judgment was based on the Grade 1 student's IQ score, which was usually known to the teacher. After three weeks of teaching, a teacher was asked to rank the nine children in his class from 1 (highest) to 9 (lowest) as to his opinion of their ability. Calculater, for these teacher-IQ ranks:

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Teacher 1 10 3 2 - 3. 4 5 2 4 5 60 7 7 8 9 9 6 8