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MMLU / The number of days it takes to build a new house has a variance of 386. A sample…

Problem

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question

The number of days it takes to build a new house has a variance of 386. A sample of 40 new homes shows an average building time of 83 days. With what confidence can we assert that the average building time for a new house is between 80 and 90 days?

choices

  1. 15.4%
  2. 17.8%
  3. 20.0%
  4. 82.1%

subject

high_school_statistics

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