Schoolchildren, of course, have had incentive to cheat for as long as there have been tests. But high-stakes testing has so radically changed the incentives for teachers that they too now have added reason to cheat.
Obtaining a copy of the exam early--that is, illegitimately
Instruct students to randomly fill in every blank
Alternating pattern of Bs and Cs
But if a teacher really wanted to cheat-and make it worth her while-she might collect the students’ answer sheets, and in the hour or so before turning them in to be read by an electronic scanner, erase the wrong answers and fill in correct ones.
Up to this point in the test, the fifteen students’ answers were virtually uncorrelated
Three of the students’ (numbers 1, 9, and 12) left at least one answer blank before the suspicious string and then ended the test with another string of blanks. This suggests that a long, unbroken string of blank answers was broken not by the student buy by the teacher.