You Are Trying to Interpret the Data from a Twin

Multiple Choice

You are trying to interpret the data from a twin study on happiness that was recently published. The researchers measured self-reported happiness across various sets of twins who were either identical or fraternal, and either raised together or apart. Which of the following sources of variance would you be unable to make statistical statements about, based on this design?

A) variation attributable to genetic factors
B) variation due to a shared family environment among those reared together
C) variation attributable to factors that are not related to either genetics or whether someone is raised in the same environment (such as unique individual experiences)
D) variation attributable to genetic factors and shared family environment
E) this design would allow you to make statements about all of the sources of variance listed here