Final answer:
Personnel records are an internal data source for an information system, while economic conditions, population statistics, and competitors are external data sources.
Step-by-step explanation:
Personnel records are an internal data source for an information system. They contain information about employees, such as their names, positions, salaries, and performance evaluations. These records are essential for managing human resources within an organization.
Other options mentioned in the question, such as economic conditions, population statistics, and competitors, can be considered external data sources. Economic conditions refer to factors like GDP, inflation rate, and unemployment rate, which impact an organization and its operations. Population statistics provide information about the demographic characteristics of a population, such as age, gender, and income. Competitors refer to other organizations or businesses operating in the same industry.