618 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



Table 143. — Variables: Beta score, test 6 X beta total score. Group X: Special experimental group. 



BETA TOTAL. 



Table 144. — Variables: Beta score, test 7 X beta total score. Group X: Special experimental group. 



BETA TOTAL. 



Table 145. — Variables: Alpha scores, test 1 X mental age Stanford-Binet examination. Group X: Special experimental 



group. 



STANFORD-BINET MENTAL AGE.' 



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w 



Ph 



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1 In the original tables from which computations were made intervals of one half year mental ages were used. In the present table 5 include 

 the range from 5 to 5.9 years 6 the range from 6 to 6.9 years, etc. 



