A Researcher Wants to Know How Anxiety Affects Serum PH

Multiple Choice

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:

A) Randomized experimental
B) Quasi-experimental
C) Comparative
D) Associational