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Hypothesis testing

The USGS decides to use a laser altimeter to measure the height μ of Mt. Wrightson, the highest point in Pima County, Arizona. It is known that measurements made by the laser altimeter have an expected value equal to μ and a standard deviation of 1 meter. How many measurements should be made if the USGS wants to construct a 0.90-level confidence interval for μ that has a length of 20 centimeters?

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