STATISTICS-FOR-BUSINESS5 MIN READ
Sample Funnel: Where Inference Breaks
Identify how population, frame, response, and completion losses affect the strength of an inference.
Trace the sample funnel before Victor makes an all-returns claim. Returns Survey Inference Funnel Target population All return transactions last month 4,800 Reachable frame Transactions with loyalty ID or email 2,900 Invited sample Randomly selected reachable returns 600 Completed survey Returned usable survey 240 Critical item complete Answered the satisfaction question 188 Coverage narrows who could be reached
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