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MMLU / A confidence interval estimate is determined from the monthly grocery…

Problem

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question

A confidence interval estimate is determined from the monthly grocery expenditures in a random sample of n families. Which of the following will result in a smaller margin of error? I. A smaller confidence level. II. A smaller sample standard deviation. III. A smaller sample size

choices

  1. II only
  2. I and II
  3. I and III
  4. II and III

subject

high_school_statistics

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Official source

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