Think About It
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Population: HR directors at fortune 500 companies Parameter: Proportion who find that surveys intrude on workdays Sampling frame: List of HR directors known to business magazine Sample size: 115 Sample design: Voluntary response Other issues: Presumably, those who find surveys intrusive lack time to reply. -
Population: Production of the snack foods manufacturer Parameter: Mean weight of bags Sampling frame: All cartons produced daily Sample size: 10 cartons × 2 bags each Sample design: A cluster sample. Cartons are a simple random sample of the production; the two bags sampled within the cartons (also a stratified sample period) Other issues: How are the bags chosen from a carton? -
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