Does coaching raise SAT scores? Because many students score higher on a second try even without coaching,
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Question:
The SAT study doesn't show that coaching causes a greater increase in SAT scores. One plausible reason is that
4200 students is too few to draw a conclusion.
more students were not coached than were coached. there was no random selection.
students who chose to coach were different (in particular, they were richer) than students who had no coaching.
Related Book For
Data Analysis and Decision Making
ISBN: 978-0538476126
4th edition
Authors: Christian Albright, Wayne Winston, Christopher Zappe
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