Researchers are developing a new pet vitamin they claim will help reduce anxiety in cats. There are 45 identified breeds of cats, so the researches randomly select two cats of each breed to test their theory.

A. Propose a matched-pair design to help the researchers test their product. Include all necessary details on randomization and identify a possible response variable you could use to test the treatment.

B. Explain how their sampling plan may be lacking in replication.

C. List some possible confounding variables.