Students in an online statistics course were prone to become increasingly disengaged as the semester progressed. In Spring 2015, we took a proactive measure to retain student engagement by introducing a cyber mentoring session. We describe the framework, operation and effectiveness of cyber mentoring in improving students' learning experience and performance. With the implementation of cyber mentoring, the percentage of online students passing the class increased from 76% to 94%, and the mean score of online students increased from 74.6 to 83.2 (out of 100), while the corresponding parameters did not change significantly for students in the face-to-face classes.