Students bring many misconceptions about psychology to the introductory psychology course. We investigated whether scores on a 10-item Knowledge of Psychology Test (adapted from Vaughan, 1977) taken on the first class day were related to final class grades in 11 introductory psychology classes taught by the same instructor at three colleges. A total of 178 undergraduate students decided whether each of 10 statements referring to common psychology misconceptions was true or false. Overall, 83% of students held 5 or more misconceptions out of 10. We found a significant negative correlation between the number of misconceptions held and class grade. Misconceptions remain prevalent among undergraduates and continue to be predictive of student performance. Learning about the content, causes, and consequences of holding psychology misconceptions may be helpful to students and educators as they embark on an introductory psychology course. (Contains 1 table.)