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8 10 6 4 5 7 8 12 8 15 14 10 10 7 5 8 6 10 4 8 a. What is an estimate of the proportion defective for the piston manufacturing process when it is

8 10 6 4 5 7 8 12 8 15
14 10 10 7 5 8 6 10 4 8
a. What is an estimate of the proportion defective for the piston manufacturing process when it is control?
b. Construct a p chart for the manufacturing process, assuming each sample has 200 pistons.
c. With the results of part (b), what conclusion should be drawn if a sample of 200 has 20 defective pistons?
d. Compute the upper and lower control limits for an np char.
e. Answer part (c) using the results of part (d).

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