32 EMPLOYMENT PSYCHOLOGY Table of Ranks and Resulting Correlations Name of Rank in Rank in Rank in Girl Production First Test Second Test A. . . I I . . . . 8 B... 5 C... 3 3 • • • • 3 D... 4 4-•• • 2 E. . . s S --- 4 F. . . 6 6.... 7 G... 7 7-•• ■ 9 H... 8 8.... I I.... 9 9-•• • IO J-... IO.... 6 Correlations. i. oo -19 per hour is ranked as number one, the one who turns out next most as number two, and so on down the line to number ten. Every girl having been ranked on the basis of output from 1-10, the next step is to take one of the tests in question and rank each of the ten girls in the same fashion according to her work in that test. We are now ready to compare the output of the girls with their rank in the test. For the sake of explanation, let us suppose that the first girl in production was first in the test; the second in production, second in the test; the third in production, third in the test, etc., right through the group, the tenth or lowest in output being tenth or lowest in the test. It is evident from this that we should have a perfect agreement or correlation between the performance of the girls in the test and their performance in their regular work. Now, let us suppose that, in another test, there was not such an agreement. Suppose that the girl who was high