. The data shown here are the deviations from nominal thameter for holes drilled in a carbon-fiber composite material used in aerospace manufacturing. The values reported are deviations from nominal in ten-thousandths of an inch.

(a) Set up Fand R chants on the process.
Is the process in statistical control?

(b) Estimate the process standard devia-
tion using the range method.

(c) If specifications are at nominal +100, what can you say about the capability of this process? Calculate the PCR Co.

Sample Number X1 Iz 24 123 -30 +50 -20 +10 +30 2 0 +50 -60 -20 +30 -50 +10 +20 +30 +20 4 -10-10 +30 -20 +50 5 +20 40 +50 +20 +10 6 0 0 +40 -40 +20 7 0 0 +20 -20-10 8 +70 -30 +30 -10 0 9 0 0 +20 -20 +10 10 +10 +20 +30 +10 +50 11 +40 0 +20 0 +20 12 +30 +20 +30 +10 +40 13 +30 -30 0 +10 +10 14 +30 -10 +50 -10-30