Question: Alloy composition process capability. Refer to Exercise 12.28 as it relates to the 20 preliminary subgroups on percents of aluminum content. The acceptable range for

Alloy composition process capability. Refer to Exercise 12.28 as it relates to the 20 preliminary subgroups on percents of aluminum content. The acceptable range for the percents of aluminum is 3.8%

to 4.2%. ALLOY

(a) Obtain the individual observations and make a Normal quantile plot of them. 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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