## IntelligenceOther Conceptions Of IntelligenceDetecting Absurdities Giving The Family Name Finding Rhymes Giving Similarities Three Things Correlation Between I Q And The Teachers' Estimates Of The Children's Intelligence Duration Of The Examination The Ball-and-field Test (score 2 Inferior Plan) Interpretation Of Pictures Average Adult Alternative Test 2: Comprehension Of Physical Relations Repeating Five Digits Reversed Keeping The Child Encouraged Counting Thirteen Pennies Naming Sixty Words The Validity Of The Intelligence Quotient Problem Of The Enclosed Boxes Desirable Range Of Testing Repeating Six Digits Reversed Naming Familiar Objects Differences Between Abstract Terms |
## How To Find The I Q Of Adult SubjectsNative intelligence, in so far as it can be measured by tests now available, appears to improve but little after the age of 15 or 16 years. It follows that in calculating the I Q of an adult subject, it will be necessary to disregard the years he has lived beyond the point where intelligence attains its final development. Although the location of this point is not exactly known, it will be sufficiently accurate for our purpose to assume its location at 16 years. Accordingly, any person over 16 years of age, however old, is for purposes of calculating I Q considered to be just 16 years old. If a youth of 18 and a man of 60 years both have a mental age of 12 years, the I Q in each case is 12 / 16, or .75. The significance of various values of the I Q is set forth elsewhere. Here it need only be repeated that 100 I Q means exactly average intelligence; that nearly all who are below 70 or 75 I Q are feeble-minded; and that the child of 125 I Q is about as much above the average as the high-grade feeble-minded individual is below the average. For ordinary purposes all who fall between 95 and 105 I Q may be considered as average in intelligence. Next: Material For Use In Testing Previous: The Use Of The Intelligence Quotient
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