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A problem with cross-sectional research is that: A. retesting leads older subjects to do better. B. the results tend not to be worth the large investment. C. cohort differences can make it difficult to differentiate between developmental change and cohort differences. D. the most intelligent people are most likely to drop out of the study.

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A problem with cross-sectional research is that:

A. retesting leads older subjects to do better.
B. the results tend not to be worth the large investment.
C. cohort differences can make it difficult to differentiate between developmental change and cohort differences.
D. the most intelligent people are most likely to drop out of the study.

 
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