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1) C-Spec, Inc., is attempting to determine whether an existing machine is capable of milling an engine part that has a key specification of 4+6 .003 inches.
After a trial run on this machine, C-Spec has determined that the machine has a sample mean of 4.001 inches with a standard deviation of .002 inch.
a. Calculate the Cpk for this machine.
b. Should C-Spec use this machine to produce this part? Why?
2) Ten samples of 15 parts each were taken from an ongoing process to establish a p-chart for control. The samples and the number of defectives in each are shown in the following table:
Number of Number of Defective Items Defective Items Sample n in the Sample Sample n in the Sample
1 15 3 6 15 22 15 1 7 15 03 15 0 8 15 34 15 0 9 15 15 15 0 10 15 0
a. Develop a p-chart for 95 percent confi dence (1.96 standard deviation).
b. Based on the plotted data points, what comments can you make?
Central Tendency of Sample Means As was shown earlier (Advantages of SPC: feedback, the use of individual output measurements as the basis for process adjustment is inappropr
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