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If I want to compare exam scores for exams to describe how students scored at different...

If I want to compare exam scores for exams to describe how students scored at different points in the semester.

Exam 1 M= 75 SD= 5

Exam2 M=87 SD= 2

Exam3 M=80 SD=15

On which exam did all the students have similar grades?

On which exam did students receive the lowest letter grades?

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