Researchers can gather data from a sample population after the fact by:

Question

Quizplus · Accepted Answer

Asking questions on a survey is a common method for gathering data from a sample population after the fact. This can provide valuable information about the thoughts, opinions, and behaviors of the population in question. Setting up a control group or conducting an experiment would involve manipulating variables and testing for outcomes, which may not be possible after the fact. Observing behavior may also be difficult to do retroactively, especially if the behavior was not recorded or documented at the time it occurred.

Researchers Can Gather Data from a Sample Population After the Fact