upnorthkyosa said:
I'm sure there have been studies comparing children of low SES and high SES when they have been given equal educational opportunities at school?
As far as what the parents can give their children, I wonder if there have been studies that have explored this as well?
I would predict that parents with higher IQs would tend to give their children more that would aid them educationally.
Well, yes and no... certainly, children from higher SES and/or more educated parents do, as a group, perform better on IQ tests - but the strongest correlation that has been found is that these children have a larger, more diverse vocabulary, which they learned, primarily, from their parents. The key question, which has yet to be satisfactorily answered, in my opinion, is how much of this improved vocabulary is due to inherited cognitive ability, and how much is due to hearing a wider range of vocabulary in the environment - not just from parents, although they are key, but from parents' friends and coworkers and their children.
I also rather like your analogy of the bowl - the one thing to watch out for is that not only are the tests a snapshot of the person's functioning on that one day, which can be affected by a wide variety of factors, including emotional disturbance (depression has been clinically proven to lower obtained scores on IQ tests), rapport with the assessor, investment in the assessment process, linguistic and cultural background, and so on - but, especially for those at the farther ends of the spectrum, ability and achievement often do not match. I have several students at school who have IQs in the 60-75 range, who demonstrate skills on achievement tests in the 75-90 range, and vice versa. The strengths and weaknesses in an individual's cognitive abilities can have a great deal to do with this, as can internal and external motivation, instructional methods, and so on. So to continue your analogy, some people fill their bowls to overflowing, while others only fill a fraction - but the size of the bowl varies from person to person.
Another point to ponder: IQ scores can vary widely, and tend to move toward the center over time; that is, individuals whose IQs are in the very low (<70) or gifted (>130) range at one testing will tend to have scores that move toward the average/normal of 100 - not much, but an individual who obtains a 60 during the first assessment will likely gain a few points the second time, and an individual who obtains a 140 during the first assessment will likely lose a few points. The changes are small, but statistically significant. In addition, students who are assessed for special education
must have cognitive assessments done at least twice if the first assessment occurs before the age of 10, as the score variations are
much greater for younger children, in both directions.