Follow-up to ethnic groups and military service: Readers asked some very fine questions about the earlier post. Here are the answers:
1. Mean score for Jews: .37 (about average)
2. West Indian IQ: the GSS does not have direct IQ data, but only 13% of all West Indians (ages 25-50) have completed at least a 4-year degree, compared to 26% of all Americans (in that age range).
3. Protestant vs. Catholic Irish: .42 for the former (above average, but not the highest) and .37 for the latter.