Final answer:
Cross-sectional and longitudinal studies on older driver fatalities can yield different results due to differences in the populations being studied and the time frame of the research.
Step-by-step explanation:
When comparing cross-sectional and longitudinal studies on older driver fatalities, different results can arise due to the nature of the studies. Cross-sectional studies compare different population groups at the same time, providing a snapshot of a specific point in time. This can lead to differences in results because each group may have different social and cultural experiences that influence their driving behavior and risk of fatalities. On the other hand, longitudinal studies track the same individuals over a period of time, allowing researchers to observe changes in driving behavior and fatalities within the same cohort. By following participants over time, longitudinal studies can provide more in-depth insights into the factors that contribute to older driver fatalities.