Sam agrees to "click in" for the attendance questions and quizzes for Alex in their large lecture class. Sam takes Alex's clicker to class and both Sam and Alex appeared to get full credit for attendance. The TA and the instructor conducted a manual count of the students in class that day. Those numbers didn't match up with the number of students who clicked in for the attendance questions, so students were asked to swipe their ID on the way out of class in order to accurately record the names of those students who attended