no. 3] PSYCHOLOGICAL EXAMINING IN THE UNITED STATES ARMY. 



699 



The range of differences between the countries is a very wide one. Among the men from 

 England only 8.7 per cent were rated D or less, while among the Poles the percentage making 

 these low ratings was almost 70 per cent. In general, the Scandinavian and English speaking 

 countries stand high in the list, while the Slavic and Latin countries stand low. There is not 

 a perfect relationship between the number of very high grades and the number of very low 

 grades, although some correlation is present. 



Comparing the figures in this group with those obtained from the white draft as a whole, 

 we find that only two countries, namely, England and Scotland, exceed the white draft per- 

 centage of A's and B's. Most of the countries stand very much below the white draft figures. 

 Considering the lower grades, D, D — , and E, we find that the white draft figures come exactly 

 in the middle of the group. Here again the split is approximately between the Slavic and Latin 

 countries and the others. 



After the completion of the preceding analysis the method of combining different examina- 

 tions outlined in chapter 2 became available and this method has been applied to the national 

 groups shown in table 218. Here the distributions are given in terms of the combined scale, 

 together with the means, standard deviations, and numbers of cases. The mean mental 

 age, stated at the bottom of the table, has the value corresponding to the mean on the com- 

 bined scale, as indicated by the regression equation. It is less significant than the value in 

 terms of the combined scale, but is given as a rough indication of the meaning of the numbers 

 in this scale. The national groups are arranged in rank order of their means from left to 

 right. 



It will be noted that the differences are considerable (an extreme range of practically two 

 years mental age) and that the countries tend to fall into two groups: Canada, Great Britain, 

 the Scandinavian and Teutonic countries all fall in the class interval between 13 and 14 points, 

 whereas the Latin and Slavic countries fall in the class interval between 11 and 12 points. 

 Most of the successive differences, when the difference is compared with its probable error, 

 are significant. The least significant difference lies between Great Britain and Scandinavia. 

 All the differences between the two larger groups mentioned above and many of the others 

 give ratios of the difference to its probable error that are greater than 6.5 (show a probability 

 that the difference is in the direction found of 1.0000, using four-place tables). 



Table 218. — Intelligence and nativity of foreign-born recruits (Groups I, II, III) in terms of theoretical combined scale 



(chap. 2). 



