# Question

Use a computer or calculator to complete the calculations and the hypothesis test for this exercise. Delco Products, a division of General Motors, produces commutators designed to be 18.810 mm in overall length. (A commutator is a device used in the electrical system of an automobile.) The following data are the lengths of a sample of 35 commutators taken while monitoring the manufacturing process:

Is there sufficient evidence to reject the claim that these parts meet the design requirement “mean length is 18.810” at the a = 0.01 level of significance?

Is there sufficient evidence to reject the claim that these parts meet the design requirement “mean length is 18.810” at the a = 0.01 level of significance?

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