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(Solution) - A valve manufacturer produces a butterfly valve composed of two

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A valve manufacturer produces a butterfly valve composed of two semicircular plates on a common spindle that is used to permit flow in one direction only. The semicircular plates are supplied by a vendor with specifications that the plates be 2.37 millimeters thick and have a tensile strength of five pounds per millimeter. A random sample of 20 such plates is taken. Electronic calipers are used to measure the thickness of each plate; the measurements are given here. Assuming that the thicknesses of such plates are normally distributed, use the data to construct a 95%1 level of confidence for the population mean thickness of these plates. What is the point estimate? How much is the error of theinterval?


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This question was answered on: Jul 11, 2017

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