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A manufacturer of machine rods (normally distributed diameters) tests a sample of 41 rods and finds...

A manufacturer of machine rods (normally distributed diameters) tests a sample of 41 rods and finds that they have an average diameter of 13.532 mm and a sample standard deviation of 5 mm. Does the data support the supervisor's claim that the production line is producing rods that are at or larger than the target of 13.4 mm diameter? Use a 5% level of significance.

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