Question: A researcher is interested in determining whether a new formulation of rat diet leads to faster maze learning. However, the rats vary in girth and

A researcher is interested in determining whether a new formulation of rat diet leads to faster maze learning. However, the rats vary in girth and length, and the researcher wants to ensure that those factors do not bias the results. The researcher decides to pair each rat with another of similar girth and length, and then randomly assigns one rat from each pair to the treatment group (new formulation) and the other rat to the control group (old formulation). Which design did the researcher use? a. Matched-pairs design b. Posttest-only between-groups design c. Pretest-posttest between-groups design d. Block design

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