Observational Data Refer to

Observational data refer to

A) facts and figures newly collected for the project at hand.
B) facts and figures obtained by asking people questions either through personal interviews,panel discussions,or questionnaires.
C) facts and figures obtained by watching,either mechanically or in person,how people actually behave.
D) facts and figures that have already been recorded from multiple sources prior to the project.
E) conclusions developed from information obtained from a representative sample of a population.