![]() ![]() Later on, psychologists of different countries customized WAIS under their cultural and linguistic preferences. After calculating their results, the ratings on the scale were identified. ![]() Other representative considerations were also taken into account. The sample group was representative set of men, women, white, black, rural and urban population as per 1981 census. For that purpose the sub-tests were administered to 1800 USA citizens. The Wechsler Adult Intelligence Scale is a standardized IQ test. The sample group was a representative set of men, women, white, black, rural and urban people with a ratio of 1981 Census. The scale was divided into various subtests to be administered to 1800 people from the United States. The standardization process was impressive. Now some companies are using WAIS-IV and later versions. In 1997, it was standardized by putting it to various controlled age groups in the United States. The battery was termed as Wechsler Adult Intelligence Scale-Revised. He continued to improve it and finally, he replaced all old versions with a better scale in 1981. It became very popular in a short period. David Wechsler introduced his first IQ test in 1939.
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