Corrected-for-guessing scores on multiple-choice tests depend upon the ability and willingness of examinees to guess when they have some basis for answering, and to avoid guessing when they have no basis. The present study determined the extent to which college students were able and willing to comply with formula-scoring directions. (Author/CTM)

A student's choice of an answer to a test question is a coarse measure of his knowledge about the subject matter of the question. Much finer measurement might be achieved if the student were asked to estimate, for each possible answer, the probability that it is the correct one. Such a procedure could yield two classes of benefits: (a) students…