A researcher wants to know how anxiety affects serum pH levels. He has three groups of participants: low, medium, and high anxiety. He obtains blood samples and measures the serum pH of each participant. He is also interested in the effects of gender on serum pH levels and adds gender as a second IV to his research design. The research approach is:

Question

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Comparative research designs are used to compare two or more groups of participants on one or more variables. In this case, the researcher is comparing three groups of participants (low, medium, and high anxiety) on serum pH levels.

A Researcher Wants to Know How Anxiety Affects Serum PH