For example, when children with the worst reading scores are selected to participate in a reading course, improvements at the end of the course might be due to regression toward the mean and not the course's effectiveness.
Improvements at the end of the course might be due to regression toward the mean. This is for example. Improvements at the end of the course might be due to regression toward not the course's effectiveness. This is for example. Children with the worst reading scores are selected to participate in a reading course.