A FIRST EXPERIMENT 
37 
Correlations 
Kind of Work No. of Card Sort. Cane. No. Group 
Girls Test Test Checking 
Shell inspecting 51 -55 -63 -7* 
Bullet inspecting 10 .52 -4& 62 
Cartridge inspecting 28 .49 .26 .58 
S. S. inspecting 30 .13 .11 .02 
laid off. By this process both extremes had been elimi 
nated; that is, the slow girls had been laid off and the fast 
girls had modified their pace to suit the retarded pace 
°f production. Thus, all the girls who were left tended 
t0 accomplish about the same amount of work per day. 
These conditions made the production of these girls an 
unfair indication of their relative ability under normal 
conditions, and consequently made it impossible to ob 
tain a fair estimate of the tests on the basis of produc 
tion. This was especially true in the case of the paper 
shot shell inspectors where the lowest correlations were 
found. In fact, the average difference in the rate of pro 
duction between these girls was only two and two-tenths 
Per cent of the average day’s work, as contrasted with an 
average of twenty-seven per cent in the case of shell in 
spectors. The average difference for the four groups was 
as follows: 
Per Cent. 
1. Shell inspectors 27.7 
2. Bullet inspectors 18.7 
3. Cartridge inspectors 6.9 
4. P. S. S. inspectors 2.2 
t can readily be seen from this that the smaller the aver 
se difference between the quantity of work done by the 
w °rkers of each group, the lower the correlations in the