The diameters of steel shafts produced by the certain manufacturing procedure should have mean diameter of 0.355 inches. The diameter is known to have standard deviation of 0.0008 inch. A random sample of 14 shafts has average diameter of 0.3545 inches.
Test these hypotheses using alfa=0.05. What are your conclusions?
Determine the P value for this test.
Develop a 95 percent confidence interval on the mean shaft diameter.