An instrument maker has randomly selected and submitted 20 of its electronic blood-pressure measurement units to a medic

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answerhappygod
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An instrument maker has randomly selected and submitted 20 of its electronic blood-pressure measurement units to a medic

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An instrument maker has randomly selected and submitted 20 ofits electronic blood-pressure measurement units to a medicallaboratory for testing. At the lab, each unit measures the “bloodpressure” of a testing device that simulates a human arm; withinthe device the pressure is a known constant. For the instrumentssubmitted for testing, the standard deviation of the readings is1.4 millimeters. Assuming a normal distribution of measurementvalues, determine the 98% confidence interval for the populationstandard deviation of instruments produced by thismanufacturer.
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