A group of people age 40 are compared to a group aged 70. This type of research is called:

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Cross-al comparison is the comparison of two or more groups of individuals who are of different ages at the same point in time. In this scenario, the group of 40-year-olds is compared to the group of 70-year-olds at the same time, which makes it a cross-al study. Longitudinal studies follow the same group over time, while time-of-measurement studies compare the same group at different time points. A cohort effect refers to the influence of a group's shared experiences, such as growing up during a particular historical period, on their behavior or outcomes.

A Group of People Age 40 Are Compared to a Group