Dr. Sheila Roberts, head of the Department of Public Administration at Eastern Seaboard State University, is concerned about whether student performance in online courses is worse than student performance in traditional courses. Specifi cally, she believes that the lack of face-to-face student–instructor interaction in online courses may be an impediment to learning. To test this hypothesis, Dr. Roberts randomly selects the final grades from 240 students enrolled in Principles of Public Administration over the past year (120 students from online sections and 120 from traditional sections). What can Dr. Roberts conclude about her hypothesis?