RD - Commission on Dietetic Registration (CDR) Practice Test

In experimental research, what is the variable that is manipulated called?

1. Dependent variable

2. Independent variable

3. Population variable

4. Individual variable

The correct answer is: Independent variable

In experimental research, the variable that is manipulated is referred to as the independent variable. This variable is intentionally changed by the researcher to observe how it affects another variable, known as the dependent variable, which is measured or assessed in response to the manipulation. Understanding this concept is crucial for designing experiments and interpreting results, as it helps determine the cause-and-effect relationship between variables. In this context, the independent variable is the factor that the researcher controls or alters, while the dependent variable depends on the outcomes of these manipulations. Recognizing the difference between these two types of variables is fundamental for anyone studying research methods, as it informs the methodology and structure of experimental designs.