228 



MENTAL HYGIENE 



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Intelligence op these/ me.ru 



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as 



The Army Alpha ,es was given o MOO^men in 

 the United States army in the World War. It con- 

 sisted of 212 questions. Grade A was given to those 

 answering correctly 135 or more of the 212 questions; 

 grade B for 105 to 134 correct answers. A was earned 

 by only 4.5% of the men. Compare the results attained 

 by the other groups of men as shown in the table. 



The scientific measurement of intelligence, most frequently used 

 as individual tests, is a series of performance tests arranged in the 



order of difficulty. The 

 first of such tests was 

 worked out by two French 

 psychologists, Alfred 

 Binet and Theodore 

 Simon. These tests have 

 been N revised by different 

 persons in America, and 

 among these revisions is 

 one by Terman, known 



&S Tke Stanford Revisit 

 o f ifo Bluet-Simon Scale. 

 ThlS SCale includes tests of 



memory, language COm- 



1 . . , 



prehension, size 01 vocab- 

 ulary, knowledge of familiar things, judgment, and many other 

 mental tasks that are a part of every child's experience. Stand- 

 ards, to show what children of certain ages should know, have been 

 established by comparisons of the results or ratings made by chil- 

 dren of definite ages in all sections of the country. For instance, 

 there are a certain number of questions that a six-year-old child is 

 supposed to answer correctly. If a particular child of six answers 

 less than this score, he is said to have a mental age, M.A., of four 

 or five, or whatever age that score is supposed to measure. If he 

 answers more than the required number, he may have a mental 

 age of seven, eight, or even more. Thus there are tests ranging 

 in difficulty from those for a three-year-old child to those given 

 to an adult. For the practical purpose of measuring progress in 

 school the intelligence quotient, I.Q., is used. This is obtained by 

 dividing a child's mental age by his age in years. This quotient 

 will usually remain fairly constant from year to year, for his men- 



