Determining the level of? significance-piston diameter

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Problem: The piston diameter of a certain hand pump is 0.6 inch. The manager determines that the diameters are normally? distributed, with a mean of 0.6 inch and a standard deviation of 0.006 inch. After recalibrating the production? machine, the manager randomly selects 22 pistons and determines that the standard deviation is 0.0041 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the alpha equals α=0.05 level of? significance?

Reference no: EM132422241

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