# Question

The data shown in Table 6E.4 are the deviations from nominal diameter for holes drilled din 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 x and R charts on the process. Is the process in statistical control?

(b) Estimate the process standard deviation using the range method.

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

(a) Set up x and R charts on the process. Is the process in statistical control?

(b) Estimate the process standard deviation using the range method.

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

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