Chapter 2 Answers - TEST BANK 360
2.11. The diameters of steel shafts produced by a certain manufacturing process should have a mean diameter of 0.255 inches. The diameter is known to have a standard deviation of = 0.0001 inch. A random sample of 12 shafts has an average diameter of 0.2545 inches. (a) Set up the appropriate hypotheses on the mean . H0: = 0.255 H1: 0.255 ................
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