Which of the following is an example of a well-focused survey purpose?

A well-focused survey purpose is one that clearly defines the specific area of inquiry and the target group it aims to study. In this case, the statement "To ascertain what people know about HIV/AIDS" reflects a precise objective aimed at understanding a particular knowledge area among a specific population. This focus allows researchers to tailor their questions to assess knowledge levels, misconceptions, and information sources regarding HIV/AIDS, leading to more actionable insights.

The other options lack the specificity that characterizes a well-focused survey purpose. The aim of collecting general information about personal experiences is too broad and does not target a specific subject or population, which can result in data that is difficult to analyze effectively. Evaluating the effectiveness of local educational programs is also more general, as it does not specify which programs or what criteria will be used to measure effectiveness. Additionally, finding out the average income of participants, while focused on a specific metric, does not provide context regarding why this information is being gathered or how it will contribute to broader research goals. Thus, the clarity and targeted nature of the first option make it the best representation of a well-focused survey purpose.