There is no correlation between class width and student achievement. Class width is arbitrary (there are rules of thumb for class width, and it depends on the range of the data).
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There would be a negative correlation in the classroom, of a student's grades, with the number of days absent from class.
It was by the achievement of the whole class that we raised the grade level.
No correlation. The mark you get in your exam, relates to the number of correct answer you have given. It has nothing to do with your class attendance.
The average number of magazine subscriptions sold per student for each class are Mr Brown's class: 72/24 = 3 subs per student; Mrs Garcia's class: 98/28 = 3.5 subs per student. Thus Mrs Garcia's class sold more subscriptions per student.
The answer is 52