Even though more than 2.3 percent of people have IQs below the 70 cutoff, the best estimate is that only 1 percent of the population has intellectual disability. The prevalence of intellectual disability is lower that the prevalence of low IQs because

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many individuals with low IQs have adequate adaptive skills.

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only people younger than age 18 can be diagnosed with an intellectual disability.

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IQ tests are not reliable.

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most forms of intellectual disability have biological causes.

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Even though more than 2.3 percent of people have IQs below the 70 cutoff, the be...

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