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That makes the IQ estimates an imperfect sample, as some students may be changing majors for graduate school.

I’d like to see this analysis redone with the SAT scores of students tied to their final undergraduate college major rather than intended graduate school major.

But when I ran across an ETS-curated data set of average student IQs by college major, I couldn’t avoid putting this visualization together.

Below, I plotted several college major’s estimated average student IQ over the gender ratio of that major. A shockingly clear correlation: the more female-dominated a college major is, the lower the average IQ of the students studying in the major.

A naive reader may look at this graph and conclude that men are smarter than women, but it is vital to note that, on average, men and women have about the same IQ.

By popular request, here’s an interactive version of the above chart: https://plot.ly/~etpinard/330/us-college-majors-average-iq-of-students-by-gender-ratio/ IQs are typically classified as follows: Considering that many of the female-dominated majors heavily involve interpersonal interactions, my initial thought was that this all made sense: Women are widely known to be more socially-inclined and nurturing than men, so we would expect to see them dominate fields that heavily involve people.

But how does that explain the drastic IQ differences between male- and female-dominated fields, if the average man and woman have the same IQ?

The answer comes from the fact that the IQ score here is estimated from the students’ SAT score.

I have always been very thankful that I could do these calculations in my head because it saved me money.

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