Professor Higgins compared the incidence of post-traumatic stress disorder in veterans who were stationed in Iraq to those who were in the military at the same time, but were stationed elsewhere. Professor Higgins conducted a(n)
A) field experiment.
B) quasi-experiment
C) observational experiment
D) natural experiment.

Question

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The Answer of Professor Higgins compared the incidence of post-traumatic stress disorder in veterans who were stationed in Iraq to those who were in the military at the same time, but were stationed elsewhere. Professor Higgins conducted a(n)
A) field experiment.
B) quasi-experiment
C) observational experiment
D) natural experiment.

Professor Higgins Compared the Incidence of Post-Traumatic Stress Disorder in Veterans