no. 2.] PSYCHOLOGICAL EXAMINING IN THE UNITED STATES AKMY. 



Median score o/unselected men on beta tests — 653 English-speaking, 9 capips. 



539 



Tests.... 



Medians. 



14.2 



5 

 14.2 



12.7 



5.9 



8.6 



Table 191. — Correlation of beta with school grade, 597 white school children o] Petersburg, Va. (r*=0.85) — School grade 



(by halj years). 



Section 3. — Correlations of tests of examination a. 



For the analysis of examination a, especially with reference to its revision, use was made of 

 all available material showing the intercorrelations of the separate tests or the correlation of 

 each with the total. In the absence of an external standard for comparison the value of such 

 data is limited. High correlation of one test with every other, and therefore with the total, 

 would indicate that this test is most like the total in "whatever it is that the whole examina- 

 tion measures," and that it is therefore the best single test to use in place of the total. It 

 would not follow, however, that this is the most valuable test in the combination in which it 

 appears. On the other hand, the mere fact of a low correlation of one test with the others or 

 with the total is no indication of value unless it is known that this test correlates highly with 

 an outside standard. 



Tables 192 to 197 present intercorrelations of tests for two groups of enlisted men, one 

 group of successful candidate officers, and two groups of college freshmen. In considering 

 these correlations it should be remembered that the latter three groups are highly selected, 

 and therefore have a narrower range of scores than the former two. This would affect the cor- 

 relation coefficients. 



Table 198 shows correlations of separate tests with total weighted scores for several types 

 of groups. The range affects the size of the correlation coefficients; furthermore, the correla- 

 tion with total score is partly determined by the weighting already assigned to each test in 

 that total. 



Table 192. — Intercorrelations of tests oj examination a — Three hundred and third Engineers, Camp Dix, 895 cases unse- 



lected except for rejection of 41 cases who made zero in all tests. 



Test. 



1. Oral directions 



2. Memory span 



3. Disarranged sentences 



4. Arithmetical problems 



5. Information 



6. Synonym — antonym 



7. Practical judgment 



8. Number series completion . 



9. Analogies 



10. Number comparison 



Average 



0.522 

 .570 

 .675 

 .691 

 .664 

 .611 

 .557 

 .641 

 .600 



.615 



0.522 



.443 

 .58* 

 .556 

 .561 

 .510 

 .446 

 .535 

 .500 



.517 



0.570 

 .443 



.620 

 .664 

 .615 

 .575 

 .552 

 .628 

 .459 



.570 



0.675 

 .584 

 .620 



.739 

 .737 

 .604 

 .603 

 .692 

 .651 



.656 



0.691 

 .556 

 .664 

 .739 



.793 

 .696 

 .464 

 .677 

 .660 



.660 



0.664 

 .561 

 .615 

 .737 

 .793 



.711 

 .637 

 .746 

 .590 



.673 



0.611 

 .510 

 .575 

 .604 

 .606 

 .711 



.501 

 .621 

 .543 



.597 



0.557 

 .446 

 .552 

 .603 

 .464 

 .637 

 .501 



.685 

 .508 



0.641 

 .535 

 .628 

 .692 

 .677 

 .746 

 .621 

 .685 



.533 

 .640 



0.600 

 .500 

 .459 

 .651 

 .660 

 .590 

 .543 

 .508 

 .533 



.560 



