Cross-sectional studies compare people of different cohorts.
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Q19: Julian Stanley found that mathematically-precocious children are
Q20: Research is quite consistent in demonstrating that
Q21: Success in designing a valid test of
Q22: Intelligence test scores are more stable during
Q23: A child?s IQ score on an individual
Q25: In longitudinal studies, mean intelligence test scores
Q26: Both cross-sectional and longitudinal studies reveal substantial
Q27: Greater age-related declines in mental abilities have
Q28: The greatest age-related decline in intelligence has
Q29: A fairly consistent finding of research on
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