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A coaching program targets students who scored in the bottom 10% of a diagnostic SAT (approximately 150 points below the population mean). After coaching, students average 90 points improvement. Educational research shows SAT test-retest correlation is r = 0.80. Assuming the coaching program had zero effect, what improvement would be expected from regression to the mean alone?
A coaching program targets students who scored in the bottom 10% of a diagnostic SAT (approximately 150 points below the population mean). After coaching, students average 90 points improvement. Educational research shows SAT test-retest correlation is r = 0.80. Assuming the coaching program had zero effect, what improvement would be expected from regression to the mean alone?