What is a good control group for a research study on people with eating disorders?
A) A group that is drawn from the sample of people with eating disorders.
B) People who used to have eating disorders but no longer say they do.
C) People who have an eating disorder and a wide range of educational backgrounds.
D) A group that is comparable to those with eating disorders except they eat normally.
D
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For an important characteristic, you would expect the highest correlations between
(a) fraternal twins reared together (b) fraternal twins reared apart (c) identical twins reared together (d) identical twins reared apart (e) not enough information is given to answer the question