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## IntelligenceThe Use Of The Intelligence QuotientIntelligence Tests Of Delinquents Comparison Of Lines Other Fallacies In The Estimation Of Intelligence Getting Into Rapport Superior Adult 5: Repeating Seven Digits Reversed Alternative Tests: Repeating Seven Digits Feeble-mindedness (rarely Above 75 I Q) Alternative Test: Forenoon And Afternoon Induction Test: Finding A Rule Desirable Range Of Testing Intelligence Tests Of Retarded School Children Correlation Between I Q And The Teachers' Estimates Of The Children's Intelligence Interpretation Of Pictures Superior Adult 3: Repeating Eight Digits Giving Sex Sources Of Data Quiet And Seclusion The Validity Of The Individual Tests Problem Of The Enclosed Boxes |
## The Use Of The Intelligence QuotientAs elsewhere explained, the mental age alone does not tell us what we want to know about a child's intelligence status. The significance of a given number of years of retardation or acceleration depends upon the age of the child. A 3-year-old child who is retarded one year is ordinarily feeble-minded; a 10-year-old retarded one year is only a little below normal. The child who at 3 years of age is retarded one year will probably be retarded two years at the age of 6, three years at the age of 9, and four years at the age of 12. What we want to know, therefore, is the ratio existing between mental age and real age. This is the intelligence quotient, or I Q. To find it we simply divide mental age (expressed in years and months) by real age (also expressed in years and months). The process is easier if we express each age in terms of months alone before dividing. The division can, of course, be performed almost instantaneously and with much less danger of error by the use of a slide rule or a division table. One who has to calculate many intelligence quotients should by all means use some kind of mechanical help. Next: How To Find The I Q Of Adult Subjects Previous: Finding Mental Age
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