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?

Question

Quizplus · Accepted Answer

The observed differences in memory performance across age groups could be due to biological changes, cohort differences, or differences in practice or use of memory skills. Without further information, any of these explanations could be valid.

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