The relative difficulty of three achievement examinations

A study of the relative difficulty of three educational achievement tests when administered to three classes of sixth-grade children (N = 128) in a counterbalanced practice order. The mean CA of the children was 12-6, and it was found that the Unit Attainment Scale gave an average EA of 12-7, the New Stanford V gave an average EA of 11-9, and the Modern School Achievement Test I gave an average EA of 12-0. The differences in difficulty among these tests were not consistent but varied with the subject measured. The authors suggest the need for caution in accepting the norms given with each of the tests.