Many high-quality sources of data sets are freely available online. Find both free repositories, library subscribed resources, and those that charge a fee for data here. Data-intensive databases, useful for discovering statistics, are limited to ERAU students, faculty, and staff.
Occasionally you may find data sets in published literature. Unfortunately, the citation of research data is often incomplete. Sometimes the best you will get is the title of the data set used, but check to see if the data or a related publication are cited and follow it up.