The “dumb blonde” is a a stereotype of long standing, and apparently it has no scientific standing whatsoever:
Jay Zagorsky, a researcher at Ohio State University … has published a study showing that the discrimination against blondes isn’t just harmful, it simply isn’t founded in reality. Back in 1979, the US Bureau of Labor Statistics surveyed 10,787 people between the ages of 14-21 as part of the National Longitudinal Study of Youth 1979 (NLSY79). The participants all took part in the Armed Forces Qualification Test, which the Pentagon uses to determine the intelligence of new recruits. Zagorsky only looked at white people in his study because he wanted the results to reflect hair colour alone and not be influenced by ethnic differences (e.g. one ethnic group might have better access to education than another).
The study found that naturally blonde women had a slightly higher average IQ than women with other hair colours. This doesn’t mean blondes are necessarily smarter as the difference wasn’t significant. The key finding is that blondes aren’t any less intelligent than brunettes or anyone else.
Two points here:
- As a soldier in the 1970s, I took the AFQT; it didn’t strike me as being culturally biased or anything, which of course could have meant that it was biased in my favor, inasmuch as I’m a whitish sort of guy.
- No blonde woman has ever shown the slightest interest in me, which might indicate a tendency toward good judgment.