Data talks

How much does test prep raise SAT scores? “The combined effect of coaching on the SAT…is about 20 points [.1SD]...[T]he average effect of coaching is nowhere near the levels…suggested by…test preparation companies.”https://t.co/frm6IkZcnM
SATSD (p.70) https://t.co/u2zV2CJYoL pic.twitter.com/FjAn0i4xhW

— Thomas Coyle (@ThomasRCoyle) December 30, 2019