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Twenty-five senior citizens in a city were randomly sampled. The average monthly out-of-pocket cost for prescription drugs for the sample was found to be $300,

Twenty-five senior citizens in a city were randomly sampled. The average monthly out-of-pocket cost for prescription drugs for the sample was found to be $300, with a standard deviation of $100. The standard error would then be

  • A. $20
  • B. $30
  • C. $40
  • D. $50
  • E. None of the above

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