The percentage of people diagnosed with an intellectual disability has ________ over the past 80 years because intelligence tests have been ________.

Question

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Intelligence tests have been restandardized over the past 80 years, which means that the norms for the tests have been updated to reflect the changing population. This has resulted in an increase in the percentage of people diagnosed with an intellectual disability, as the new norms are more stringent than the old norms.

The Percentage of People Diagnosed with an Intellectual Disability Has