Among the design criteria for a machine producing molding powder are that it will produce cylindrical pellets by extrusion through in. spinneret holes. These pellets are produced by cutting the...

Among the design criteria for a machine producing molding powder are that it will produce cylindrical pellets by extrusion through in. spinneret holes. These pellets are produced by cutting the strings of polymer so produced into pieces /6 in. long. To determine whether the unit was performing properly, a sample of 100 pellets was selected and examined. The mean length determined was 0.197 in. The standard deviation was 0.005 in. Test the hypothesis that the unit was in proper working order using a two-tailed t-test at the 0.05 and 0.01 significance levels.