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?

Xiao is using a 'Cross-Sectional' Study to look for developmental differences in each individual.

Explanation:

Cross-sectional study is used to investigate a “variable” which are the “developmental differences” and “number of meals eaten daily” here, in different groups i.e., the mentioned age groups who are related to other characteristics. This research includes a group of people who differ in numbers or variable of interest but there are some characteristics like educational background, socioeconomic status and ethnicity, are shared among them equally.

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