Which of the following must be present in experimental research?
A) A comparison group made up of different subjects
B) Convenience sample of subjects from the population
C) Matching of subjects on demographic characteristics
D) Random assignment of subjects to groups

Question

Quizplus · Accepted Answer

Three essential elements of experimental research are random assignment of subjects to groups, researcher-controlled manipulation of the independent variable, and researcher control of the experimental situation and setting.
Subjects may serve as their own controls. Three essential elements of experimental research are random assignment of subjects to groups, researcher-controlled manipulation of the independent variable, and researcher control of the experimental situation and setting.
Convenience samples are not required. Three essential elements of experimental research are random assignment of subjects to groups, researcher-controlled manipulation of the independent variable, and researcher control of the experimental situation and setting.
The matching of subjects on demographic characteristics is not necessary in experimental research; random assignment is preferable. Three essential elements of experimental research are random assignment of subjects to groups, researcher-controlled manipulation of the independent variable, and researcher control of the experimental situation and setting.

Which of the Following Must Be Present in Experimental Research