Distinguish sample surveys, experiments, and observational studies; explain randomization in each.
Decide whether a study can be generalized to a broader population
Problem
Does this study design support generalization to a broader population: random sample from \(\text{all}~\text{county}~\text{residents}\)?
Big Picture
What this problem is really about
Population generalization is governed by the source of the sample. A chance-based sample from a covering frame supports inference to the population represented by that frame, but not automatically to a larger region whose members could not enter. Because different random samples can yield different statistics, the generalization must retain sampling uncertainty rather than claim certainty.
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