Different samples from the same population are studied at different points in time in regards to a specific phenomenon. This is a classic example of a

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Different samples from the same population studied at different points in time, such as sequential opinion polls, are classic examples of a trend study. In a panel study, data are collected from the same subjects at multiple points in time. A cohort study is a panel study comprised of individuals who represent a specific age- or time-related event or population.

Different Samples from the Same Population Are Studied at Different