What type of research participants should researchers use for studies of cause-and-effect relationships?
A. Controlled samples
B. Random samples
C. Related samples
D. Skilled samples
Answer:B
What type of research participants should researchers use for studies of cause-and-effect relationships?
A. Controlled samples B. Random samples C. Related samples D. Skilled samples
Explanation: B) Random assignments are critical for establishing cause-effect relationships. If such assignments are NOT employed, the researcher will be unable to determine whether treatment differences are caused by the treatments themselves or by the treatment groups being different in some important way that is related to the outcome being studied.