Approximately how many infants have some type of sex chromosome disorder?

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

a. -.16. b. +.06. c. +.16. d. +.66. e. +.95.

Which people are most likely to have been in therapy at some point in their lives?

a.) young adult men from the South. b.) elderly women from the Midwest. c.) high-school educated, middle-aged men and women from the Northeast. d.) highly educated, middle-aged women from Western states.