As the number of variables in a research study increases,what happens to the number of subjects needed to prove an outcome?

Name: As the number of variables in a research study increases,what happens to the number of subjects needed to prove an outcome?
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As the number of variables increases, the complexity of the study increases, making it more difficult to prove an outcome. Therefore, a larger sample size is required to ensure that the relationship between the variables is statistically significant.

As the Number of Variables in a Research Study Increases,what