CHES (Certified Health Education Specialist) Practice Exam 2026 – Your All-in-One Guide to Exam Success!

A primary data source is one that provides original and firsthand data collected directly from participants or through specific research methods, rather than information that has already been analyzed or summarized by others. Written questionnaires are tools used to gather this original data directly from respondents, allowing researchers to capture their insights, opinions, and experiences in real-time. This direct engagement is characteristic of primary data collection, making written questionnaires the correct choice.

In contrast, sources such as CDC Reports, peer-reviewed publications, and the Morbidity and Mortality Weekly Report analyze and summarize data that has already been collected, making them secondary sources. They interpret existing findings rather than generating new data directly from a population or study group.