Which of the following statements is true concerning medical research studies?
A. Subjects are not randomly assigned to either a treatment group or control group.
B. To be considered reliable, the same results must be obtained by no other researchers conducting the same study.
C. Researchers assign participants to either a treatment group or control group in order of when the participants register for the study.
D. Clinical studies attempt to establish cause-and-effect relationships.
Answer:D
Which of the following statements is true concerning medical research studies?
A. Subjects are not randomly assigned to either a treatment group or control group. B. To be considered reliable, the same results must be obtained by no other researchers conducting the same study. C. Researchers assign participants to either a treatment group or control group in order of when the participants register for the study. D. Clinical studies attempt to establish cause-and-effect relationships.