No. 2.] 



PSYCHOLOGICAL EXAMINING IN THE UNITED STATES ARMY. 517 



Table 155. — Percentage distribution of scores by camps: Examination a — Officers (white). 



i Indicates less than 0.1 per cent. 



The medians for the various stations are given in table 156 and show the same general rela- 

 tionship. The same order of precedence appears also in the means, given in table 157. For 

 the latter the probable errors of the differences have also been computed in order to determine 

 the significance to be ascribed to the apparent differences. Table 158 shows the ratio of the 

 difference between any two means to the probable error of this difference. The Dix officers 

 fail to be distinguished from either the Lee or the Taylor officers by a difference equal to four 

 times the probable error. Accordingly the apparent differences between these groups can not 

 be stressed. All other groups differ by decidedly more than four times the probable error. 

 Since the degree of irregularity of procedure which existed in the examining of the enlisted men 

 was not present for the officers we may, therefore, accept these differences as established. 



It will be remembered that in all comparisons of enlisted men by camps, Lee ranked con- 

 spicuously low. It is of interest to note that its officers do not stand in this position with 

 reference to the other camps. In fact the mean for the Lee officer groups is practically identical 

 with that for all four camps. 



Table 156.- 



-Comparison of officers by camps, showing medians, upper and lower quartiles, and quartile deviations — 



Examination a. 



All camps. 



Median 



Upper quartile.( Qj) 



Lower quartile (Qi) 



Quartile deviation (Q) 

 Number of cases 



296 

 327 

 259 

 34 

 5,563 



Table 157. — Comparison of officers by camps: Means and standard deviations — Examination a. 



