What is a confounding variable and why do researchers try to eliminate confounding variables? Provide two examples of confounding variables

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 What is a confounding variable and why do researchers try to eliminate confounding variables? Provide two examples of confounding variables.2. What are the advantages and disadvantages of posttest only design and pretest-posttest design?3. What is meant by sensitivity of a dependent variable?4. What are the differences between an independent groups design and a repeated measures design?5. How does an experimenter