Question: Alloy composition process capability (optional). Obtain the individual observations from the 20 preliminary subgroups studied in Exercise 12.28. The acceptable range for the percent of

Alloy composition process capability (optional). Obtain the individual observations from the 20 preliminary subgroups studied in Exercise 12.28. The acceptable range for the percent of aluminum is 3.8% to 4.2%.

(a) Make a Normal quantile plot of the 60 observations. What do you conclude? (If your software will not make a Normal quantile plot, use a histogram to assess Normality.)

(b) Estimate Cp.

(c) Estimate Cpk .

(d) Comparing your results from parts

(b) and (c), what would you recommend to improve process capability?

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