Sampling: This refers to the process by which participants are selected for a study. In our analogy, it's choosing every 10th person at the mall.
Questionnaire: A tool used in survey research, consisting of a series of questions designed to gather information about specific aspects. It's like your list of ice cream flavors for people to choose from.
Population: The entire group that researchers want to draw conclusions about. In our analogy, this could be all visitors at the mall.