Although undergraduate students are often involved in academic research as volunteers, paid assistants or to receive extra-credit, very little attention has been paid to how well these students perform when they assist researchers. The current study compares the number of surveys gathered at a large local event and the number of missing entries for each survey among students who participated voluntarily, who received extra-credit, and who are required to spend a certain amount of hours of service per semester. Our results show that no significant difference exists among these three groups in terms of the number of surveys completed and the number of missing entries. These results suggest that students who receive extra-credit are as motivated as those who voluntarily participate in a large scale survey. Thus, researchers do not jeopardize survey quantity or quality by giving extra-curricular credits to students when a large scale survey needs to be conducted.