In 1985, a psychologist interested in SES influences gave IQ tests to groups of 50-, 60- and 70-

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In 1985, a psychologist interested in SES influences gave IQ tests to groups of 50-, 60- and 70-year-old adults. Each group was tested twice more, in 1995 and then again in 2005. Which design was used? ? cross-cultural ? cross-sectional ? longitudinal ? sequential