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MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



Table 377. — Intelligence and occupation. Median and quartile scores in examination alpha of occupational groups in 



study by Surgeon General's Office. 



The number at the left is the classification number for the occupation assigned by the committee on classification of 



personnel . 



T=Total. 

 A=Apprentice. 

 J = Journeyman . 

 E=Expert. 



M=Median. 

 Qi=First quartile. 

 <? 2 =Second quartile. 

 No. =Number of caBes. 



GROUP A (250 OR MORE CASES). 



7g 

 8g 

 lOg 

 12g 

 13 

 14p 

 15b 

 171f 

 ISr 

 18s 

 22a 



Occupation. 



Farmer, 6,886. 



Laborer, 1,453. 



General machinist, 1,251 . 



Lathe hand, 310. 



General blacksmith, 351 . 



General carpenter, 792. 



Generalelectrician, 499. 



General miner, 852 . 



Painter, 648. 



Plumber, 270... 

 Brakeman, 814 . 



Locomotive fireman, 734 . 



Receiver and shipper, 374 . 



Stoekkeeper, 412 



Auto chauffeur, 2,754. . 



23t Heavy truck chauffeur, 1,019 . 



24g 



27h 



27t 



General auto repairman, 1,249. 

 Stationary gas engineman, 293.. 



Horse hostler, 1.021 . 



Teamster, 2,730 . 



