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).

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).