Xiao is gathering research on the number of meals people eat. He gathers data about the number of daily meals eaten by 25 people at each of the following ages – 10, 20, 30, 40, 50, 60, and 70 years – over the course of one week, and looks for developmental differences. What type of research design is Xiao using?

a. Continuous
b. Cross-sectional
c. Sequential
d. Longitudinal

b.Cross-sectional                        

Explanation:

Cross-sectional research design: In psychological research, the term "cross-sectional research design" is described as one of the types of observational study or research design. However, an experimenter or researcher, while conducting cross-sectional research tends to measure or analyse the outcome and related exposures in the participants involved simultaneously i.e, the research is being conducted at a specific period in time.

In the question above, Xiao is using a cross-sectional research design.

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step-by-step explanation:

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