(solution) In a study conducted to determine familial correlations for IQ

(solution) In a study conducted to determine familial correlations for IQ

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In a study conducted to determine familial correlations for IQ scores, the following results were
obtained:
Category Sample size Predicted correlation Monozygotic twins
reared together
Monozygotic twins
reared apart
Dizygotic twins reared
together
Biological siblings
reared apart
Non-biological twins
reared together
Parent and biological
child staying together
Parent and adopted
child staying together 34 1.00 Actual median
correlation
0.85 3 1.00 0.67 41 0.50 0.58 69 0.50 0.45 5 0.00 0.29 32 0.50 0.39 6 0.00 0.18 a)
b)
c)
d) What is the main objective of the study?
Do you agree or disagree with the methodology employed? Why?
What are the significant findings of the study?
In your opinion, are there aspects of the study that can be improved to make it more
rigorous?