Professor Yarnofsky Wonders Whether Recent Acts of Airline Terrorism Have

Multiple Choice

Professor Yarnofsky wonders whether recent acts of airline terrorism have made the public more fearful of airline flight.He secures records of the amount of flight insurance that people have purchased via machines at the airport,and compares the records of insurance purchases before the last hijacking to purchases after the last hijacking.Professor Yarnofsky has employed a(n) ________ research method.

A) correlational
B) participant observation
C) archival
D) systematic observation
E) experimental