Is there a test for normal intelligence and mental retardation?

Yes, there are standardized tests designed to assess intelligence, such as the Wechsler Adult Intelligence Scale (WAIS) and the Stanford-Binet Intelligence Scales. These tests provide a measure of cognitive abilities and are used to determine an individual's IQ (intelligence quotient). Mental retardation, now referred to as intellectual disability, is diagnosed based on an IQ score typically below 70, along with significant limitations in adaptive functioning. However, it's important to consider multiple factors, including social and environmental influences, when assessing intellectual capabilities.