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We want to determine the percentage of downtime of plastic injection machines in the EDMM department...

  1. We want to determine the percentage of downtime of plastic injection machines in the EDMM department by work sampling. A confidence level of 99% and an absolute accuracy of 5% are expected. Suppose that a pilot with a total of 100 observations were made, and in the preliminary study 45 observations showed the machines down.
  1. How many random observations will be needed?
  2. Express the average proportion as a confidence level.
Math   Statistics-And-Probability   
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