Which argument is most similar to the flaw of inferring broad conclusions from a small, unrepresentative sample?

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Hasty generalization is at play here: drawing a broad conclusion from a small, unrepresentative sample. Concluding that the country will have a large population increase based on growth seen in a single city takes a one-off, local observation and extends it to a national scale without enough data from other cities or longer time periods. The city could be experiencing temporary factors that don’t apply nationwide, so this leap to a global claim relies on insufficient evidence.

The other scenarios involve more limited or different kinds of evidence. A pilot study showing positive results is a preliminary step; it’s understood that findings from a small study need to be tested with larger, more representative samples before making wide claims. A single patient with a side effect is anecdotal and signals a possible issue, not a definitive rule about all drugs. And a product well-rated at one retailer only shows popularity within that retailer’s audience, not across all markets. All of those involve small samples or limited contexts, but the clearest, most sweeping leap to a broad conclusion from a tiny, nonrepresentative sample is the country example.