A researcher using the twin study method finds an average correlation of .50 between monozygotic twins' scores on a measure of self esteem. The researcher finds an average correlation of .30 between dizygotic twins' scores on this measure. The difference between the size of the correlations is statistically significant. What conclusion might the researcher draw from these results?
A. Genetics has more of an influence on self esteem than environment has.
B. There is evidence for a genetic influence on self esteem.
C. There is no evidence for a genetic influence on self esteem.
D. The results are opposite of what would be expected if there were a genetic influence on self esteem.
Question 2
Personality researchers sometimes examine the personalities of children who were adopted shortly after birth. They do this because
A. these children were likely raised in a very supportive, nurturing environment.
B. genetic and environmental influences are not confounded like they are when examining children raised by their biological parents.
C. extensive records of the child's health and early personality indicators are available.
D. the researchers want to know if adoption is traumatic for the children.
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