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Politics : The Obama - Clinton Disaster -- Ignore unavailable to you. Want to Upgrade?

To: DuckTapeSunroof who wrote (38583)	9/28/2010 9:05:20 PM
From: John	Read Replies (1) \| Respond to of 103300

Buddy wrote: "Presumably that would be explainable by the very commonsense understanding that WEALTH produces both better health care and nutrition." Rushton wrote about the findings of Arthur Jensen, et al., in the publication Medical Hypotheses in 2008. ssc.uwo.ca excerpt: Genetic theory predicts the precise magnitude of the regression effect. Black children with parents of IQ 115 regress to the Black IQ average of 85, while White children with parents of IQ 115 regress to the White IQ average of 100. Regression to a lower average IQ helps to explain the fact that Black children born to high IQ, wealthy, Black parents have test scores 2–4 points lower than do White children born to low IQ, poor White parents. In one study, Jensen tested the regression predictions using data from siblings (900 White sibling pairs and 500 Black sibling pairs). These provide an even better comparison than parent–offspring comparisons because siblings share very similar environments. Black and White children matched for IQ had siblings who had regressed approximately halfway to their respective racial means rather than to the mean of both races combined. For example, when Black children and White children were matched for IQs of 120, the siblings of Black children averaged close to 100, whereas the siblings of White children averaged close to 110. A reverse effect was also found for children matched at the lower end of the IQ scale. When Black children and White children were matched for IQs of 70, the siblings of the Black children averaged about 78, whereas those of the Whites averaged about 85. Throughout the range of IQ from 50 to 150 the results were exactly as predicted by genetic theory, not by culture-only theory. [...] Contrary to many hopes and some claims, the narrowing of the gap between Black–White social conditions has not led to any change in the magnitude of the Black–White IQ difference in over 100 years. Massive society-wide interventions such as ending segregation, the subsequent nationwide program of school busing to achieve racial balance, and the Head Start programs have failed to reduce the differences. Head Start programs did produce modest gains in school retention and graduation rates among Whites – but not Blacks. Other large scale, often well-publicized, countywide amelioration projects (such as the $2 billion program in affluent Montgomery County, Maryland, as well as the Kansas City, Missouri, school district, under judicial supervision since 1985), have not reduced the Black–White achievement gap (despite low student–teacher ratios and computers in every classroom). Whenever closely examined, culture-only theories have proven incapable of explaining race differences in IQ. Adjusting for socioeconomic status only reduces the Black–White IQ difference by about one-third. Nor does the evidence support other culture-only hypotheses such as test bias, test anxiety, or the consequences of being a minority in a White society. Culture-only theories have proven especially inadequate in explaining East Asian IQs because, despite lower socioeconomic conditions, they average slightly higher in IQ and educational achievement than do Whites. One culture-only hypothesis currently promoted is based on the secular increase in test scores. It is known as the Flynn Effect after James Flynn’s demonstration that the average IQ in several countries has systematically increased by about 3 points a decade over the last 50 years. He extrapolated these findings to imply that the 15-point IQ difference between Blacks and Whites will gradually disappear over time. However, analyses show that the Flynn Effect is not on the g factor, the principal source of the Black–White difference. Moreover, there has been no narrowing of the Black–White IQ difference over the last 100 years.