Professor Grant is interested in studying how a sense of humor changes over time. She collects data from separate groups of 6-year-olds, 16-year-olds, 26-year-olds, and 46-year-olds. What type of research design is Professor Grant using?

Name: Professor Grant is interested in studying how a sense of humor changes over time. She collects data from separate groups of 6-year-olds, 16-year-olds, 26-year-olds, and 46-year-olds. What type of research design is Professor Grant using?
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The Answer is D

Professor Grant Is Interested in Studying How a Sense of Humor