Longitudinal studies of IQ change during childhood suggest that
A) some children may show shifts in IQ as large as 40 points or more.
B) the majority of children show shifts in IQ at least as large as 30 points.
C) most children show increases in IQ over the course of childhood.
D) the average correlation between IQ measured at age 3 and that at age 18 is approximately .80.
Correct Answer:
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