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.

Question

Quizplus · Accepted Answer

A correlation of +.66 indicates a strong positive relationship between the intelligence test scores of the 80-year-old Scots and the scores they had received as 11-year-olds. This suggests that intelligence remains stable over a long period of time.

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