Which of the following is a necessary component of experimental design?
a. Attrition
b. Comparison of naturally occurring groups
c. Convenience sample
d. Manipulation of the independent variable
ANS: D
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.
All research would try to prevent attrition. 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.
This is not a component of an experimental design. 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.
A convenience sample is not desired in an experimental study. 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.
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