When Ian Deary and His Colleagues Retested 80-Year-Old Scots,using an Intelligence

question 56

Multiple Choice

When Ian Deary and his colleagues retested 80-year-old Scots,using an intelligence test the Scots had taken as 11-year-olds,the correlation of their scores across seven decades was

• A) -.16.
• B) +.06.
• C) +.16.
• D) +.66.