Lieutenant edgar beaver believes that officers who take, Ask an Expert

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Lieutenant Edgar Beaver believes that officers who take master's-level courses receive higher officer efficiency ratings (OERs). Using a sample of 100 officers, Beaver regresses OERs (Y-it ranges from 0 to 100) on the number of courses each officer took beyond the BA. He finds

What can Beaver say based on these results? Beaver has a 10-course master's degree. What is the best estimate of his OER? Place a 90% confidence limit around this estimate.

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