PSYCHOLOGICAL MEASUREMENTS. 



603 



B. Word reactions were taken on 9 evenings with Squad A. The 

 averages for these individual subjects are at the bottom of table 171 

 and range from 415 o- for Bro to 597 a for Can, with a total average for 

 the 10 men of 486 a. The coefficient of variability for the individual 

 series of reactions is from 7 to 13 per cent of the reaction time, the 

 average for the 10 subjects being 9.3 per cent. These average figures 

 for Squad A compare fairly well with the results found with normal 



Table 171. — Squad A — Time and variability of word reaction. 

 [M. in a; S. D. in cr; and C. in per cent.] 



subjects and during normal sessions by Dodge and Benedict/ who 

 report the average reaction time for a group of normal subjects as 

 455 <r and the average mean variation^ about 8.0 per cent of the aver- 

 age latency. 



Individual subjects show homogeneous averages from experiment to 

 experiment. For example, with Kon, the reaction times range within 



1 Dodge and Benedict, Carnegie Inst. Wash. Pub. No. 232, 1915, p. 106. 



* Dodge and Benedict use mean variation and not standard deviation which is larger than the 

 former (S. D. =1.253 M. V.). If the 8.0 per cent be multiplied by 1.25 to place it on the same basis 

 with our coefficient of variability, we have 10 per cent to compare with 9.3 for the low-diet research. 



