Intelligence Tests (IQ)
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In the context of the construct of intelligence and its historical measurement, analyzing the first formal intelligence test developed by Alfred Binet in 1905, the concept of 'Intelligence Quotient' (IQ) propounded by William Stern in 1912, and the revision of the Stanford-Binet test by Lewis Terman in 1916: If a child with a chronological age of 8 years and 6 months (102 months) has a mental age of 10 years and 2 months (122 months) as assessed by the Stanford-Binet test, what will be their exact IQ according to Terman's revised formula, and under which category will this psychological classification fall?
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Detailed Explanation & Solution
The modern and scientific formula for calculating the Intelligence Quotient (IQ) was given by Lewis Terman in 1916 during the standardization of the Stanford-Binet test, in which Mental Age (MA) is divided by Chronological Age (CA) and multiplied by 100.
Calculation:
- Mental Age (MA) = 122 months
- Chronological Age (CA) = 102 months
- Formula: IQ = (MA ÷ CA) × 100
- Computation: (122 ÷ 102) × 100 = 1.19607 × 100 = 119.607 (approx. 119.6)
According to Terman's classification scale of intelligence, an IQ score ranging between 110 and 119 falls under the category of High Average Intelligence.
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