A school district examines a program that uses mentors to help very poor readers improve their reading performance. The children in the program are at the 4th percentile at pretest. At posttest they are around the 20th percentile. While it is possible that the program made the difference, another reason for the change in scores could be:
A) History
B) Regression artifact
C) Multiple-treatment interference
D) Differential selection

Question

Quizplus · Accepted Answer

Regression artifact refers to the statistical phenomenon where extreme scores tend to move towards the mean over time, which could explain the improvement from the 4th to the 20th percentile without the program's influence.

A School District Examines a Program That Uses Mentors to Help