Factor Analysis and Reliability of the Mental Dexterity Test

Abstract

The primary objective of the present study was to factor analyze a recently developed mental ability test in order to develop verbal and numerical subtesrs—then to establish the reliability of the subtests (and of the test as a whole) using 97 advanced college students as Ss. Using a varimax rotation, some 34 factors were extracted, the most prominent two factors being verbal and numerical in nature. Based mainly on factor-loadings, two subtests were developed—a 50-item verbal comprehension test and a 30-item numerical ability test. The KR-20 reliability coefficients for the verbal and numerical subtests were .89 and .82 respectively, whereas that for the entire 100-item test was .93.