A form of objective test has been given at various times in which the student is required to indicate how certain he is of the correctness of his answers. This may be accomplished by having an answer sheet prepared with three columns, each column representing a degree of certainty according to a so-called scale.
Proceedings of the Iowa Academy of Science
©1949 Iowa Academy of Science, Inc.
Fritz, Martin F.
"Confidence in Correctness of Responses on an Objective Test,"
Proceedings of the Iowa Academy of Science, 56(1), 255-257.
Available at: https://scholarworks.uni.edu/pias/vol56/iss1/35