Distinguish sample surveys, experiments, and observational studies; explain randomization in each.
Recognize a sample survey
Problem
Is this study a sample survey: poll asks \(800\) adults their opinion, no treatment assigned?
Big Picture
What this problem is really about
Classify the study by asking how the data are collected and whether researchers impose a condition. Here, focus on opinions obtained by questioning a group of adults and the absence of assigned treatment. We’ll compare those features with the defining criteria for surveys, experiments, and studies that only record preexisting behavior, then name the design.
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