A company manufactures rolled steel for nuclear submarines. To monitor the production process, a quality control inspector

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A company manufactures rolled steel for nuclear submarines. To monitor the production process, a quality control inspector sampled finished rolls of steel from the production line, one each hour for 12 consecutive hours. The number of imperfections discovered on each roll is recorded in the table.

a. Construct a control chart for the number of imperfections per finished roll of steel.

b. Locate the center line and upper and lower control limits on the chart.

c. Does the manufacturing process appear to be in control?

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Statistics For Engineering And The Sciences

ISBN: 9781498728850

6th Edition

Authors: William M. Mendenhall, Terry L. Sincich

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