Why are extraneous variables limited or eliminated in a well-designed study?

Question

Quizplus · Accepted Answer

Extraneous variables are variables that are not of interest in the study but may still have an effect on the dependent variable. When designing a study, it is important to limit or eliminate extraneous variables to avoid them competing with the independent variable as an explanation of the study's outcome. This helps ensure that the study's results are valid and reliable.

Why Are Extraneous Variables Limited or Eliminated in a Well-Designed