Drop-forged steel handles have a designed weight of 10 ounces. Five samples of four observations each have been taken. Use the sample data in conjunction with the table provided to you to construct upper and lower control limits for both a mean chart and a range chart. Is the process in control?

Using the appropriate control chart, determine two - sigma control limits for each case:
(i) An inspector found an average of 3.9 scratches in the exterior paint of each of the automobiles being prepared for shipment to dealers.
(ii) Before shipping lawn mowers to dealers, an inspector attempts to start each mower and notes any that do not start on the first try. The lot size is 100 mowers, and an average of 4 did not start (4 percent).

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Sample 3 Sample 4 Sample 5 Sample 1 Sample 2 10.2 10.3 9.9 9.7 9.8 9.9 9.9 10.2 9.8 9.9 10.3 9.9 9.8 10.3 10.1 10.1 10.4 10.1 10.5 9.7