Abstract
The object of this study is to determine the applicability of the Spearman-Brown prophecy formula to college marks on the undergraduate and master's levels in Colo rado State College of Education. In order to do this, the reliability of teachers' marks for two groups of students was computed: (i) students on the undergraduate level, and (2) students on the master's level. The reli ability of teachers' marks for these two groups was predicted by the use of the Spearman Brown formula. The correspondence between actual and predicted coefficients of reliability of teachers' marks was determined for both groups.
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