A School District Examines a Program That Uses Mentors to Help

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

Correct Answer:

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