Which of the following is NOT a methodological problem in longitudinal research that may lead to overly optimistic conclusions about the degree of maintenance of intellectual skills into late old age?
A) attrition of the least healthy or able subjects from the sample
B) unrepresentative samples, including primarily better-educated adults
C) Subjects who take the same tests several times tend to improve with practice.
D) differences in the amount of education between the oldest and youngest subjects
Correct Answer:
Verified
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