A psychologist who is studying the mathematical abilities of adults finds significant differences between the scores of adults born 50 years ago, when rote learning was stressed, and those born 25 years ago, when more “progressive” approaches to education were popular. This is an example of a(n): A. failure of longitudinal research. B. cohort difference. C. advantage of cross-sectional research. D. intellectual decline in middle adulthood.

A psychologist who is studying the mathematical abilities of adults finds significant differences between the scores of adults born 50 years ago, when rote learning was stressed, and those born 25 years ago, when more “progressive” approaches to education were popular. This is an example of a(n):

A. failure of longitudinal research.
B. cohort difference.
C. advantage of cross-sectional research.
D. intellectual decline in middle adulthood.

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