A college admissions officer, defending the college's use of SAT scores in the admissions process, produced the following graph. It shows the mean GPAs for last year's freshmen, grouped by SAT scores. How strong is the evidence that SAT Score is a good predictor of GPA? What concerns you about the graph, the statistical methodology or the conclusions reached?

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SAT vs. GPA 3.5 3.25 2.75 2.5 2.25 900 1000 1200 1400 1600 Combined SAT Score