Kristin wants to ask the managers of the fast food restaurants in a large city “How do you retain employees?” What condition must be true to justify surveying only a sample of the managers instead of surveying the entire population of managers?

A sample is justified when surveying every manager would require too much time or money. Since the population is all fast-food restaurant managers in a large city, a complete survey may be impractical, so Kristin can survey a representative sample instead. The population being small would make surveying everyone easier, not less necessary.

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