Observational data refer to
-facts and figures newly collected for the project at hand.
-facts and figures that have already been recorded from multiple sources before the project.
-conclusions developed from information obtained from a representative sample of a population.
-facts and figures obtained by watching, either mechanically or in person, how people actually behave.
-facts and figures obtained by asking people questions either through personal interviews, panel discussions, or questionnaires.
Answer: facts and figures obtained by watching, either mechanically or in person, how people actually behave.