A useful function for assessing the effect of guessing on true-false and multiple-choice tests

A table of critical passing scores was assembled for assessing the effects of blind guessing on the results of true-false and multiple-choice tests. This useful tabulation also represents an intermediate step toward development of a more comprehensive model for nonblind guessing in Bayesian statistics. By checking this table for various forms of tests, one can make a decision with 95% confidence as to whether the correction for guessing is necessary for grading a true-false or multiple-choice test A function in the Microsoft Excel software is described to extend the table.