From wikipedia > Psychometricians generally regard IQ tests as having high statistical reliability.[10][65] Reliability represents the measurement consistency

From wikipedia > Psychometricians generally regard IQ tests as having high statistical reliability.[10][65] Reliability represents the measurement consistency of a test.[66] A reliable test produces similar scores upon repetition https://en.wikipedia.org/wiki/Intelligence_quotient#Reliability_and_validity https://en.wikipedia.org/wiki/Intelligence_quotient#Reliabil... > The correlation comes from low scores. Look at the pictures in this study, that is absolutely not the case, and it will take only a minute to verify. Frey, M. C., & Detterman, D. K. (2004). Scholastic Assessment or g? Psychological Science, 15(6), 373–378. doi:10.1111/j.0956-7976.2004.00687.x