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C. The test variable (independent variable) and outcome variable (dependent variable) have no affect on each other.
Explanation:
The test variable (independent variable) and the outcome variable (dependent variable) have no effect on each other. Hence, option C is correct.
What is an independent variable?
The independent variable can be altered, manipulated and changed in an experimental study.
Researchers often measure independent and dependent variables in studies to test cause-and-effect relationships.
The independent variable is the reason or cause. Its value is independent of other variables.
The dependent variable is the outcome whose values depend on changes in the independent variable.
Hence, option C is correct.
Learn more about the independent variable here:
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