@inproceedings{EDM-2016-VailWGBWL,
	author        = "Alexandria Katarina Vail and Joseph B. Wiggins and Joseph F. Grafsgaard and Kristy Elizabeth Boyer and Eric N. Wiebe and James C. Lester",
	booktitle     = "{Proceedings of the Ninth International Conference on Educational Data Mining}",
	ee            = "http://www.educationaldatamining.org/EDM2016/proceedings/paper_77.pdf",
	pages         = "247--254",
	publisher     = "{International Educational Data Mining Society}",
	title         = "{The Affective Impact of Tutor Questions: Predicting Frustration and Engagement}",
	year          = 2016,
}