Lear Seating of Kitchener, Ontario, produces seats for Cadillacs and other GM cars and trucks. The Cadillac

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Lear Seating of Kitchener, Ontario, produces seats for Cadillacs and other GM cars and trucks. The Cadillac seat includes a part called the EK headrest. The frame of the headrest is made from steel rods. A machine is used to bend the rod into a U-shape described as shown. The width is critical; if it is too wide or too narrow, it will not fit into the holes drilled into the seat frame. The process is checked by drawing samples of size 3 every 2 hours. The last 20 samples were recorded.

240 2 mm-


a. What do these data tell you about the process?
b. If it went out of control, at what sample did this occur?
c. What is the likely assignable cause?

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