In one of his research paper, Lynn set the IQ of American Jews at roughly 110. After reading it, I realized that his approximation had many flaws. One of them is that basically he took 4 studies done in the U.S. and he calculated their mean. Why those four studies? There are some other studies that were done with much less impressive numbers. Two studies (Bachman 1970; Hernstein and Murray 1994) had sample sizes below 100. This is extremely low and therefore shouldn't be considered to be reliable studies. The other two (Levison and Block 1977; Lynn 2004) had sample sizes of 400 and 150, which is better, but somewhat on the lower end. Let's look at the tests that were administered. We have the Ammons Quick Test, the Standford-Binet, the Armed Forces Qualification Test and a Vocabulary test. All tests except the Armed Forces Qualification Test are essentially verbal aptitude tests. This is important because it is known that American Jews are known to have a high verbal IQ and an average performance IQ. This means that Lynn's IQ estimate of American Jews is grossly exaggerated. We need more reliable data before reaching any conclusion.