CHAPTER 15. 



ADDITIONAL STATISTICS ON EXA&TINATION a 



A certain amount of statistical data in addition to that discussed in connection with the 

 account of the revision of examination a was received as a result both of camp studies and of 

 special investigations with other groups. The more important of these data are presented 

 here for purposes of reference. 



Section 1. — Distributions of scores for the separate tests of examination a. 



Distributions of scores in the separate tests of examination a were received for several 

 different types of groups. These are presented herewith without discussion or computation 

 of constants. Raw scores are used in all cases. 



Since these distributions were sent in from different camps and at different times the 

 grouping of scores for purposes of summary is not always the same. For example, in test 3 

 the grouping in one case is 0-1, 2-3, etc., while for the others it is 0, 1-2, 3-4, etc. This intro- 

 duces a certain amount of awkwardness into the tables. 



A brief description of the several groups is offered, for its bearing on the interpretation of 

 results. 



Group 1. Officers, Camp Lee. — This group of officers from Camp Lee is probably reasonably 

 representative not only of the officers of Camp Lee, but of the whole group of officers given 

 examination a. (It has been shown elsewhere that the mean score of the Lee officers is prac- 

 tically the same as that for the officers of all four camps.) The numbers of cases reported for the 

 various tests varies from 569 to 576. 



Group 2. Candidate officers. Camp Dix.— This group is made up of 249 men admitted to 

 the third officers' training camp at Camp Dix who had not been given the examination pre- 

 viously as privates. 



Group S. Selected group of sergeants, Camp Devens.— This group of 176 men had been ser- 

 geants before their selection for admission to officers' training camp. They are distinctly 

 superior to the usual run of sergeants. They are doubtless more nearly representative of the 

 Devens officers' training camp group. 



Group 4. Enlisted men, Camp Devens. — These 400 cases were selected in such a way that 

 the distribution of their total weighted scores corresponds approximately to the distribution 

 of total weighted scores of all enlisted men who took examination a at Camp Devens. This 

 implies the usual segregation for illiteracy, which, we have seen (see p. 489), eliminated approxi- 

 mately 20 per cent of the cases at this camp. 



Group 5. Enlisted men, Camp Dix. — These 921 cases constitute the major part of the 

 Three hundred and thirty-third Engineers as made up in the early fall of 1917. This organiza- 

 tion was examined very completely; no elimination on the ground of illiteracy was made. 

 This procedure naturally operates to increase greatly the percentages making low scores, as 

 compared with those for the other group of enlisted men reported (group 4). 



Group 6. Negro enlisted men, Camp Lee.— The 260 negroes here reported were from three 

 companies. These men were considered typical of all the negro troops examined at Camp Lee, 

 since their distribution corresponded closely with that of the total group. It may be noted that 

 the negroes examined at Camp Lee had been found distinctly inferior to those examined at 

 Dix. 



The distributions of the various groups above described are presented in tables 176 to 185. 



533 



