Distribution & Use of IQ Scores
Normal distribution of IQ scores
Mental retardation: IQ scores:
Borderline mentally retarded: 50 - 75
Mild/moderately mentally retarded: 35 - 50
Severe/profoundly mentally retarded: 20 - 40
Mental retardation causes:
1. Organic retardation
2. Cultural-familial retardation
Vast majority (95%) of IQ scores: 70 to 130
• IQ scores & academic achievement - medium strength correlation
• IQ scores & job performance - low to medium strength correlation
Gifted IQ scores: superior 130 - 145; gifted 145+
• Binet's two warnings on potential problems of IQ Testing:
1. Intelligence tests do not measure innate abilities or natural intelligence.
2. Intelligence tests, by themselves, should not be used to label people.
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