Emile Plans a Study About the Health of Deep-Sea Divers

Multiple Choice

Emile plans a study about the health of deep-sea divers.In determining whether to use a cross-sectional design or a longitudinal design,Emile should ask,"Do I want to know about

A) diver health in a single moment in time,or diver health over time?"
B) just a few divers,or many divers?"
C) several different demographic groups,or just one?"
D) what divers say they do,or what they can be observed doing?"