Item Validities of the Otis Self-Administering Tests of Mental Ability for a College Population
slightly more difficult from Form A. (The records for Form A were randomly selected from iooo test records, but records for Form B represent all those available at the time of study.) It also appears that the test is either slightly more difficult for women or else that women are somewhat inferior to men in intel ligence. Since so much evidence has been presented in refutation of the second alterna tive, we are left with only the first, if the differences are interpreted as significant. In Table II are presented data showing the relative difficulties (per cent of correct re sponses) and relative validities (biserial cor relations) of all items in Form A of the Otis test. Presented for comparison with our own figures are those nreviouslv renorted hv Chapanis. Examination of the data in this table reveals the following facts: i. The median difference for men between the per cent of adults and the per cent of students who got each item correct is .08 (Range .00 to .25). 2. The corresponding median difference for women is .09 (Range .01 to .35).