Rising rejection of Creationism among the young; dull to smart

Below I pointed to the rise in acceptance of evolution among the young, in particular the 18-30 cohort. There were some natural questions about other correlated demographic variables (I did point to data suggesting that this is not simply a byproduct of increased secularity of the young). Naturally one wonders about the impact of education. There's a problem with this: people who are 22 are far less likely to have graduate degrees than people who are 40, because most people are just finishing their undergraduate degree at this age! The comparison isn't fair (additionally, the reduction in the proportion of high school drop outs over the generations probably has changed the type of person who does not receive their diploma). But what about intelligence? The WORDSUM variable in the General Social Survey has a vocabulary test where people receive a score based on the number correct out of 10. I ...