After Doing a Large-Scale Cross-Sectional Study, a Researcher Finds That

question 30

Multiple Choice

After doing a large-scale cross-sectional study, a researcher finds that each successively older group does slightly less well on a test of memory for 10-digit telephone numbers. Which of the following is the best interpretation of this result?

• A) A basic biological change underlies the observed steady reduction of memory skill.
• B) Cohort differences probably explain at least part of the observed differences, because today's young adults are better educated and more technically sophisticated than their elders.
• C) The difference reflects level of use or practice of memory skills.
• D) Any of the above could be true.

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Definitions:

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