Analytics wrote:[q
There is no need to exaggerate your point--Murray claims it is a SD of one-- not two.
That's for
African Americans, not black Africans. As argued in the Bell Curve, African Americans are right around the borderline IQ range, mid-80's or one SD. Black Africans are right around the low 70's. Intellectual disability in IQ terms is commonly thought of as around or beneath an IQ of 70.
Here's a quote,
"One reason for this reluctance to discuss averages is
that blacks in Africa, including urbanized blacks with secondary educations,
have obtained extremely low scores. Richard Lynn was able to
assemble eleven studies in his 1991 review of the literature. He estimated
the median black African IQ to be 75, approximately 1.7 standard
deviations below the U.S. overall population average, about ten
points lower than the current figure for American black~.~Where other
data are available, the estimates of the black African IQ fall at least that
low and, in some instances, even lower. The IQ of "coloured" students
in South Africa--of mixed racial background-has been found to be
similar to that of American blacks.
In summary: African blacks are, on average, substantially below
African-Americans in intelligence test scores. Psychometrically, there
is little reason to think that these results mean anything different about
cognitive functioning than they mean in non-African populations. For
our purposes, the main point is that the hypothesis about the special circumstances
of American blacks depressing their test scores is not substantiated
by the African data. "There you have it. The notorious scientific racist Richard Lynn has estimated median black African IQ at 75, but we shouldn't dismiss that other tests seem to show it even lower. And a test of black students in Apartheid South Africa (look up the details of that test sometime, by the way) showed them not too different from American blacks, and those populations are similar in how much white DNA is mixed in, so we can reasonably conclude that there's nothing special about the social situation of blacks in America that explains their low scores.
In the Gottfredson editorial
you cited, she implicitly explains this by arguing that blacks in America are about 20% white, thus raising their IQ somewhat.
That said, do you agree with Murray's summary of the test results? Let's talk about the facts first--then the implications.
Yes and no. There are substantial problems with the testing data he cites, some of which I've directly linked on this thread. But if you were to clear away those problems, you would have IQ testing gaps to discuss.