Which statement correctly describes the relationship between the independent and dependent variables?

Which statement correctly describes the relationship between the independent and dependent variables?

• A. The dependent variable causes variation in the independent variable
• B. The independent variable is believed to cause variation in the dependent variable
• C. They are always identical
• D. They are unrelated

Answer: (B)

In experiments, the factor you actively change or manipulate is the independent variable, and the outcome you measure is the dependent variable. The statement that the independent variable is believed to cause variation in the dependent variable reflects the typical causal direction in research: changes in what you manipulate lead to changes in what you observe. For example, if you test whether a counseling intervention affects anxiety, the intervention is the independent variable and the anxiety level is the dependent variable. The dependent variable varies in response to the level of the independent variable, assuming other factors are held constant. The other ideas don’t fit this structure: the dependent variable doesn’t cause changes in the independent variable, the two are not identical, and they’re not unrelated, since the dependent variable is the observed effect of manipulating the independent variable.

In experiments, the factor you actively change or manipulate is the independent variable, and the outcome you measure is the dependent variable. The statement that the independent variable is believed to cause variation in the dependent variable reflects the typical causal direction in research: changes in what you manipulate lead to changes in what you observe. For example, if you test whether a counseling intervention affects anxiety, the intervention is the independent variable and the anxiety level is the dependent variable. The dependent variable varies in response to the level of the independent variable, assuming other factors are held constant. The other ideas don’t fit this structure: the dependent variable doesn’t cause changes in the independent variable, the two are not identical, and they’re not unrelated, since the dependent variable is the observed effect of manipulating the independent variable.