Presidential opinion polls are an example of what type of study?

Name: Presidential opinion polls are an example of what type of study?
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In a trend study, different samples from the same population are asked about the variable of interest at different points in time. In a cohort study, the same group is followed over time to see if the participants develop the dependent variable of interest. A panel study involves collecting descriptive data from the same individuals at multiple points in time.

Presidential Opinion Polls Are an Example of What Type of Study