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browniels browniels
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6 years ago
In order to estimate the average electric usage per month, a sample of 81 houses was selected and the electric usage was determined. Assume a population standard deviation of 450 kilowatt-hours. The standard error of the mean is
 a. 450.
  b. 81.
  c. 500.
  d. 50.
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6 years ago
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