PSYCHOLOGICAL MEASUREMENTS. 579 



number of wrong words given. From the general average figure in 

 the lower right-hand corner of tables 157 and 158 it will be seen that 

 the usual score is a fraction over 8 words correctly remembered and 

 recorded from the list of 25 pronounced, and on the average 1 wrong 

 word is entered. The average performance is very nearly the same 

 with both squads. With these figures in mind, the comparison of 

 the individual subjects in their memory span shows for Squad A that 

 the average number of correct words ranged from 5.9 to 12.1 {Mon and 

 Tom) and the average number of errors from 3.0 to 0.4 {Mon and Bro). 

 There were many individual records which ranged about 8 or above 

 with no errors. The highest of these was Tom of January 26, with 14 

 correct words and no errors. The largest number of errors was made 

 by Mon on November 24 ; there were 4 correct words and 7 wrong ones 

 entered at that time. There is a fair amount of uniformity in the rec- 

 ords of the individual subjects. A subject may show a variation of 2 

 on either side of his average number of correct words. 



Squad B gives about the same range of memory span as Squad A. 

 The averages of the 5 normal sessions range from 5.8 to 11.2 for words 

 correctly remembered. In these 5 experiments the subjects had not 

 received so much practice in the test as had Squad A, and the fact that 

 the average is slightly below that for the latter group can not be 

 regarded as at all significant. The number of errors was somewhat less 

 with Squad B. Two of the subjects, Tho and Mac, made no error in 

 any trial. This was a very good record, considering that in the case 

 of Mac the number of words correctly remembered was above the 

 average of these squads. Lon made a very good memory record; his 

 average for correct words for the normal period is 11.0 and for the 

 reduced-diet period 12.7. Only 2 errors were made in the 7 sessions in 

 which he served — one on October 6 and one on January 27. Another 

 subject, Ham, should be mentioned in this connection as having made 

 only 2 errors, both during the normal period, 1 each on October 6 and 

 December 15. 



The data seem homogeneous, and no violence appears to be done 

 by converting a subject's record, as shown in the number of words 

 correctly recalled and the number of errors made into one score. This 

 has been done very arbitrarily by deducting the number of errors from 

 the number of words correctly remembered. The scores thus computed 

 are given in tables 159 and 160. This simplification makes no especial 

 change in the standing of the subjects in the groups. The average 

 low-diet scores range from 2.9 to 11.3 for Mon and Tom, respectively. 

 Bro and Moy also have large averages, viz, 9.3 and 8.9. The average 

 score for all subjects in all sessions during the low diet is 7.3. Squad 

 B shows a range of variability from 3.0 to 12.3. This group is led by 

 Lon with a score for normal of 10.8 and a low-diet average of 12.3. The 

 general averages for the group of 10 individuals in all sessions is 7.2 for 



