Mentally dull persons tend to come from larger families than mentally bright persons.
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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
Q31: Intelligence test scores are negatively correlated with
Q32: First-born children tend to be brighter than
Q33: Both intelligence and occupational status are correlated
Q34: Intelligence, social class, occupation, and education are
Q35: Children who live in rural areas tend
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