The research strategy best suited for testing cause-and-effect ...

[kodithompson]

The research strategy best suited for testing cause-and-effect hypotheses is:
 
  a. panel research.
  b. cross-sectional survey research.
  c. participant observation.
  d. controlled experiments.

Question 2

The vast majority of those infected with HIV are:
 
  a. young adults who do not know they are infected.
  b. young adults who know they are infected.
  c. an unspecified age group who use drugs.
  d. an unspecified age group who have received blood transfusions.
  e. older adults drug users.

[wfdfwc23]

Answer to Question 1

d

Answer to Question 2

A