Question

multiple choice question
a control variable is a factor that is held constant in order to test the relative impact of ______.
○ a dependent variable
○ a hypothetical variable
○ the causal factor
○ an independent variable
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Explanation:

In research, control variables are kept constant to isolate and accurately measure the effect of the independent variable (the variable being tested for its impact) on the dependent variable. A causal factor is a broad term, and a hypothetical variable is not a standard research variable type in this context. The dependent variable is the outcome being measured, not the one whose impact is tested by controlling other factors.

Answer:

D. an independent variable