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Difficulty: MediumSampling and Generalization Flaws

To gauge national small-business owner optimism regarding upcoming revenue growth, a trade association surveyed 400 founders who are active members of a premier high-growth technology startup incubator in Silicon Valley. Based on the finding that 85 percent of respondents anticipated significant revenue increases in the next quarter, the association concluded that small-business owners nationwide are overwhelmingly optimistic about their upcoming financial outlook. Which of the following best identifies a reasoning flaw in the trade association's argument?

  1. It draws a broad conclusion about all small-business owners nationwide based on a sample that is likely unrepresentative of the general small-business population.Answer
  2. B
    It fails to establish that revenue growth in high-technology startups directly causes broader national economic expansion.
  3. C
    It assumes that a high level of business owner optimism is necessary for a company to achieve quarterly revenue increases.
  4. D
    It overlooks the possibility that surveyed founders may have exaggerated their projected financial performance.
  5. E
    It mistakes a statistical correlation between incubator membership and optimism for a direct causal link.

Answer

The argument flaw is that it draws a broad conclusion about all small-business owners nationwide based on a sample that is likely unrepresentative of the general small-business population.
The correct answer accurately identifies that founders in a premier Silicon Valley technology incubator represent a highly specific, resource-advantaged sector. Extrapolating their optimism to all small-business owners nationwide commits an unrepresentative sampling flaw.

Step-by-Step Solution

1
Identify the premise and conclusion of the argument.
Premise: 85 percent of surveyed Silicon Valley incubator founders expect revenue growth. Conclusion: Small-business owners nationwide are overwhelmingly optimistic.
Isolating the premise and conclusion reveals where the inductive leap occurs.
2
Evaluate the selection of the sample group relative to the target population.
The sample consists entirely of tech founders in a high-growth incubator, who operate under uniquely advantageous conditions compared to average local small businesses.
A sampling flaw occurs when the characteristics of the sample systematically differ from the target population being described.
3
Match the weakness to the corresponding answer choice.
The statement noting that the argument bases its conclusion on an unrepresentative sample correctly describes the logical vulnerability.
This choice directly identifies the flaw of overgeneralizing from a biased subset.

Key Concept

Sampling and Generalization Flaws
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Topics

Sampling and Generalization Flaws

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