An Experimenter Is Interested in the Influence of Taking a One-Semester-Long

Multiple Choice

An experimenter is interested in the influence of taking a one-semester-long test preparation course on performance on the Scholastic Aptitude Test (SAT) . She contacts high school students who have and who have not taken the course and compares their scores on the SAT exam. She finds that the students who have taken the course score significantly higher on the test. Which of the following represents the principal threat to the internal validity of this experiment?

A) Regression to the mean
B) Maturation
C) Selection
D) Attrition