Cattell Culture Fair III
In seeking to develop a culture-fair intelligence or IQ test that separated environmental and genetic factors, Raymond B. Cattell created the CFIT or Culture Fair Intelligence Test. Cattell argued that general intelligence (g) exists and that it consists of fluid intelligence and crystallized intelligence. Unlike other tests, which typically use a deviation of 15 or 16, Cattell uses a deviation of 24. This means if same normally distributed population took both tests, the central 68.2% would fall between 76 and 124 on Cattell but 85 and 115 on Stanford Binet 5 (deviation 15).
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