Identical twins raised in the same homes have IQs correlated at about .86. Identical twins raised apart have IQs correlated at about .75. Unrelated adopted children raised in the same home have IQs correlated at about .32. Based on this information and research on the heritability of intelligence, we can say that ___________________ of the population variability in intelligence can be attributed to the environment.
A) just under half
B) half
C) most
D) very little

Question

Quizplus · Accepted Answer

The correlation difference between identical twins raised together and apart suggests that the environment accounts for some variability in intelligence, but not the majority, indicating just under half.

Identical Twins Raised in the Same Homes Have IQs Correlated