Suppose you learn that two children, a 10-year boy and a 10-year old girl, have brains of quite different sizes, with the boy's brain being about 40% larger than that girl's brain
Which of the following conclusions would be the best to draw from this data?
a. The girl most likely has something wrong with her brain, because it should be at least 10% larger than the boy's brain.
b. The girl's brain most likely has something wrong with it, because it should be very close to the same size as the boy's brain at this age.
c. The girl most likely was malnourished in early childhood, giving rise to a smaller-than-average brain.
d. There is no reason for concern, since children's brain sizes can vary by as much as 50% without any appreciable difference in cognitive skills.
d
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Learning Objective 8.1
Conceptual
Difficult
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Identical twins have IQ correlations around .7 to .8, whereas fraternal twins have IQ correlations of about .3 to .4. What do these correlations suggest?
A) Identical twins have very similar IQs while fraternal twins do not. B) Both identical twins and fraternal twins have similar IQs. C) Fraternal twins have very similar IQs while identical twins do not. D) Neither identical twins nor fraternal twins have very similar IQs.
Research has uncovered that about half of the parents surveyed who had utilized an artificial insemination technique said that they
A) planned to tell their children the truth about how they were conceived. B) would definitely not disclose information about their child's conception. C) would use artificial conception techniques again. D) worried about their children hearing the truth from someone else.