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Historically, the mean assembly time for the Enyaw Kralc automobile has been 38 hours.A modification to the assembly procedure is made.A random sample of 47

Historically, the mean assembly time for the Enyaw Kralc automobile has been 38 hours.A modification to the assembly procedure is made.A random sample of 47 Kralc automobiles yields an average assembly time of 37.5 hours and a standard deviation of 1.2 hours with the new procedure .Test the claim that the average assembly time has been reduced with the new procedure.Use 0.01

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