. Trade tests; the scientific measurement of trade proficiency . he maximumon the basis of four points for each of the twenty apprentices, journeymen and experts are then arrangedseparately on four distribution curves, each black square repre-senting one mans position in the test, or his score. Accordingto the different vertical levels it is known to which class thisindividual belongs. A glance at this table shows that the ex-perts as a group score higher than the journeymen, and the 106 TRADE TESTS journeymen higher than the apprentices. As was to be expected,however, a few of t
. Trade tests; the scientific measurement of trade proficiency . he maximumon the basis of four points for each of the twenty apprentices, journeymen and experts are then arrangedseparately on four distribution curves, each black square repre-senting one mans position in the test, or his score. Accordingto the different vertical levels it is known to which class thisindividual belongs. A glance at this table shows that the ex-perts as a group score higher than the journeymen, and the 106 TRADE TESTS journeymen higher than the apprentices. As was to be expected,however, a few of the experts are as low as some of the journey-men. The extent of the overlapping is brought out veryclearly by the graph. When a diagram such as the topical oneabove has been constructed for each test, the problem is todraw the dividing lines between the various classes, so that theoverlapping shall be a minimum. The method of determiningthe position of these dividing lines is that of trial and lines are drawn at several places, and that line is. This chart shows the distribution according to individual totalscores of the 80 subjects used in standardization. Each squarerepresents one man. The limits shown are the ones finally usedin army testing. chosen which places the maximum number of men. accordingto their score in the test, in their correct known trade classifica-tion. Thus, for example, placing the dividing line betweennovice and apprentice at 19 makes the critical score of thenovice group such that it included every novice that is one out of the twenty apprentices, under these conditions,fell within the limits of score of the novice group. Similarlyplacing the point of differentiation between the journe}Tnan andapprentice class at 44, rated one apprentice as a journeyman on AN ORAL TRADE TEST 107 the test, and three journeymen were rated as high differentiating line between journeyman and expert beingplaced at 68 correctly class
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