In studying the effects of heredity and environment on intelligence, it has been helpful to analyze IQs of identical twins who were separated soon after birth.
Identical twins share identical genes inherited from the same fertilized egg. By studying identical twins raised apart, we can eliminate the variable of heredity and better isolate the effects of environment. The accompanying table shows the IQs of identical twins (older twins are x) raised apart. Use the sample data to determine whether there is a relationship between IQs of the twins. Write a summary statement about the effect of heredity and environment on intelligence. Note that your conclusions will be based on this relatively small sample of 12 pairs of identical twins.

Based on data from "IQs of Identical Twins Reared Apart," by Arthur Jensen, Behavioral Genetics.

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107 96 103 90 96 113 86 99 109 105 96 89 11 97 116 107 99 111 85 108 102 105 100 93