A company is evaluating the quality of aluminum rods received in a recent shipment. Diameters of aluminum

Question:

A company is evaluating the quality of aluminum rods received in a recent shipment. Diameters of aluminum alloy rods produced on an extrusion machine are known to have a standard deviation of 0.0001 in. A random sample of 25 rods has an average diameter of 0.5046 in. Test whether or not the mean rod diameter is 0.5025 using a two-sided confidence interval.