In a year marked by a major cheating scandal at Harvard, more than 30 percent of graduating seniors admit they have cheated on a homework assignment during their four years as undergraduates.
Fewer say they have cheated on an exam or on a paper or take-home assignment—about 7 percent for each type of assessment.
But when asked how many of their classmates had cheated, students’ estimates were much higher. They guessed, on average, that 53 percent had cheated on homework, 32 percent on papers, and 18 percent on exams. ...
http://www.thecrimson.com/article/2013/5/28/senior-survey-2013/