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In a recent investigation by one of the above authors, an attempt was made to dis cover if certain underlying characteristics distinguish excellent achievers from poor achievers in two-figure division. A screening test in two-figure division was administered to 283 pupils in 6B classes in 9 elementary schools. After the 283 pupils were found to be homogeneous in division with respect to both variability and mean achievement, they were grouped as one distribution. The upper one-third, the 90 best achievers, were selected as excellent achievers, and the lower one third, the 90 poorest achievers, were selected as poor achievers. The two groups were then measured on a number of factors thought to be associated with ability in two-figure divi sion. The two groups were first compared on these factors by means of the t test for the significance of the difference between two means. This comparison showed that excel lent achievers were significantly superior to poor achievers on all factors.
Koenker et al. (Fri,) studied this question.