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Education and Intelligence
Intelligence and Education have a complex relationship. Generally, people who are more intelligent achieve a higher level of education, and those who receive more education are more intelligent. The two, however, are not perfectly correlated, and so it is important to understand which exerts a causative influence on the other.

Education as Causal of Intelligence
There is substantial evidence to suggest that education influences intelligence. . One study took advantage of the school system in Germany to investigate the relationship between education and intelligence. The children in the sample were required to be 6 years old before they started the school year on April 1st, so it was possible to compare children who were of a similar chronological age, but had a year’s difference in schooling. They gave intelligence tests to 8-10 year olds whose birthdays fell just before or just after the dividing point. Their results showed the 8 year olds who had received an extra year in school were closer in intelligence to the 10 year olds who were a year behind, than the 8 year olds who were a year behind. This shows how education can positively affect intelligence. It is important to note, however, that the tests used were heavily loaded with questions that tested material that was learned in school. Further findings of the study showed that the differences in intelligence between the groups was particularly prominent in the tests which included a lot of school learned material. More fluid tests of intelligence, which included less class taught material, were less effected by the year of extra schooling.

Intelligence as Causal of Educational Outcomes
Longitudinal studies have shown a predictive interaction of intelligence on educational attainment. In one study which measured around 70,000 children in the UK, they investigated how a general factor in the Cognitive Abilities Test taken at age 11 correlated with GCSE scores taken at age 16. They found that the two measures correlated about 0.8 with each other, showing intelligence at age 11 is predictive of grades at age 16. In this instance, children had received the same level of education, suggesting the variance is explained primarily by differences in intelligence rather than education. The predictive effect of IQ on educational success is even apparent if IQ is measured before any formal education, with measured correlations of IQ at the beginning of education and educational attainment six year later correlating 0.46.

The military provides a natural example of how those with lower intelligence learn less effectively and benefit less from education. The effect has been demonstrated as far back as World War II in which military fighter pilots were divided into groups based on a selection battery which included ability and motivation measures. Those who were in the top group completed training the first time 95% of the time, whereas those in the bottom group only completed training 20% the first time. Examples of low level recruits have even led to disagreement over whether these men should be enlisted at all, as they are costly to train, perform at a lower level than average when trained, and simply cannot learn certain specialities. Even those in favour of hiring those who are less intelligent to the military acknowledge the limitations of these particular recruits, and instead try to get around the issue by adapting the training to cater for the mental ability of the less intelligent recruits. These findings demonstrate how intelligence is necessary for learning and any form of training, and that those who are more intelligent learn more rapidly and effectively than those who are less intelligent. This could explain the high correlations between intelligence and educational attainment.

Education and Intelligence Interaction
Evidence shows that education and intelligence have a complex interaction, and this is demonstrated in a longitudinal study by Richards and Sacker. They collected data from the British 1946 birth cohort and investigated how childhood intelligence was predictive of other outcomes later in life including educational attainment and mental ability at 53 years old (using the National Adult Reading Test). The results of the experiment produced a path model in which mental ability at 8 years old was predictive of both educational attainment by 26, and mental ability at age 53. And also, education was shown to be predictive of mental ability at age 53. The findings show that intelligence at 8 years old is directly related to intelligence in later life. There is also, however, a mediating effect of education between the two intelligence measures, showing how education can have a positive impact on intelligence. This effect, however, appears to be limited by the stronger effect of initial intelligence.

Genes and Environment Relationship with Educational Outcomes
The argument as to whether intelligence leads to more education, or education leads to greater intelligence also needs to be considered in terms of nature vs nurture. The idea of intelligence influencing educational achievement stresses genes, whereas educations impact on intelligence stresses environment. The answer to this is rarely one or the other, but a combination of the two. It is important, however, to tease out the extent to which they impact upon one another.

Parental IQ and Education
The relationship between IQ and academic performance has been shown to extend to one’s children. In a study measuring a range of family background characteristics they found that maternal IQ was a stronger predictor of children’s test scores than any other than any other family characteristics, including socio economic status. Maternal IQ predicted around 10% of the variance, with the only other consistent predictor being ‘home scale scores’, which measured the intellectual stimulation of the home environment, and predicted around 2% of the variance. The paper argues that the inherited genetic traits are more important than environment when predicting academic success. This effect, however, could arise either because of inherited genetic traits, or because more intelligent parents place greater emphasis on academic achievement, meaning it is unclear how much influence genes have.

To investigate whether the relationship between intelligence and educational attainment was inherited, Plug and Vijverberg (compared children raised by their biological parents and children who were adopted within their first year of life. They found that children who were raised by their birth parents were more similar to the family that raised them in terms of educational attainment and intelligence than those that were raised by an adopted family. They conclude that while ability is a predictor of educational attainment it is not the complete answer, leaving space for other influences, such as environment and parenting. They do argue, however, that the largest part of ability is inherited, with genetics explaining around 0.6 of the variance. This means the opposite effect, that education affects ability, is likely small.

Twin Studies
An effective way to understand the genetic and environmental influences in behaviour is to use a Twin study. Johnson, Mcgue and Iacono investigated how factors that were present at age 11 influenced the change in grades to age 17 in pairs of twins. Using the Minnesota Twin Family Study, they investigated the genetic and environmental influences on intelligence and school performance. The results of the study found that around 70% of the variance in the education variables could be attributed to genetic influences. Furthermore, education outcomes had >56% of their genetic influences were shared with intelligence. This number dropped to 34% when other predictors of school grade such as engagement in class and family risk were included in the analysis, but this is still a large portion of shared genetic variance.

Socioeconomic Status
While intelligence is clearly a predictor of success in education, there may be other variables involved that impact this relationship. Socio economic is one variable that often arises in this debate. In order to investigate this Campbell and Ramey used the results of the Abecedarian Project, which targeted children who were at high risk of academic failure and aimed to intervene and try to boost academic performance. The results showed promising improvements in IQ suggesting early intervention is important in ensuring children have the best chance of success, and socio economic status impacts the IQ of children. On the other hand, while increases in IQ were observed, the best predictor of intellectual and academic achievement was still maternal IQ, which consistently explained twice the variance than that of the next best predictor. This demonstrates that while education and socio economic status have an impact in IQ, it is still parental IQ that exert the strongest predictive effects.

Future Outcomes and Education
Research has found that education is important in reaching high level jobs, with correlations between education and job complexity being cited as high as 0.8. While this shows that education is important in successfully reaching, and performing, in high level jobs, general intelligence still plays an important role. Research has shown that an IQ of >120 is necessary to succeed in highly complex jobs such as those on an executive level. Gottfredson argues that this pattern emerges because even with sufficient training, people still need to attend to novel situations that they are not trained for and higher intelligence is required to successfully navigate the novel problems. These results demonstrate that even with a higher intelligence, education is still important in attaining higher level job positions.

The Intelligence Education Relationship
Intelligence is an important factor in how the individual responds to education. Those who have a genetic advantage of being more intelligent than others tend to perform better at school and go on to higher levels of education. This effect is also observable in the opposite direction, in that education increases measureable intelligence. Studies have shown that while educational attainment is important in predicting intelligence in later life, intelligence at 8 years old is more predictive of intelligence at 53, than measures of educational attainment. Furthermore, it is likely that this trend arises due to genetic factors. As twin studies have shown, inherited traits are more important in predicting educational attainment than any environmental measures .Also, educational attainment and intelligence share >0.5 of their genetic influences, suggesting the two are highly related.