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
 = 95 + .1X Sy|x = 1.4 sb = .07
r2 = .4  = 5 sx = 8
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.