Which of the following is not a likely factor that would create a cohort effect for a study on lifetime cognitive development in healthy people?
a. Differences in genes between individuals
b. Differences in educational practices over time
c. Changes in the nutritional availability
d. Changes in prescription drug use
Answer: A
Rationale: A cohort effect is a consequence of being born in a particular year or narrow range of years.
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a. 1 in 5 b. 1 in 10 c. 1 in 20 d. 1 in 100
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