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This chapter explores the intricate relationship between quality and cost, illustrating trade-offs through various statistical approaches. Key figures depict the probability density of uniform variables, the behavior of sums of random variables, and methodologies for process monitoring using control charts. Highlighting the significance of sampling plans and operational curves, we delve into Quality Function Deployment (QFD) as a strategic tool for aligning product quality with customer expectations. Practical examples and revised charts provide clarity on assessing and assuring quality across processes.
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Chapter Eleven Quality and Assurance
Fig. 11-1 The Trade-Off BetweenQuality and Cost
Fig. 11-2 Probability Density of a Uniform Variate on (0, 1)
Fig. 11-3 Density of the Sum of ThreeUniform Random Variables
Fig. 11-4 Density of the Sum of ThreeUniform Random Variables andthe Normal Approximation
Fig. 11-5 Frequency Histogram of 150 Measurements
Fig. 11-6 Theoretical Normal Curve of Arm Length
Fig. 11-7 Chart for Tracking Arm Data
Fig. 11-8 R Chart for Tracking Arm Data
Fig. 11-9 Preliminary p chart for Xezet floppy disk data (Refer to Example 11.2)
Fig. 11-10 Revised p chart for Xezet floppy disk data (Refer to Example 11.2)
Fig. 11-11 Successive Cycles in Process Monitoring
Fig. 11-12 The Behavior of G(n, k) as afunction of k (Refer to Example 11.5)
Fig. 11-13 The Ideal OC Curve
Fig. 11-14 OC Curve for Spire Records (n = 10)
Fig. 11-15 Revised OC Curve for Spire Records (n = 25)
Fig. 11-16 Two Realizations of a Sequential Sampling Plan
Fig. 11-17 Sequential Sampling Planfor Spire Records (Refer to Example 11.8)
Fig. 11-18 ASN Curve for Spire Records (estimated)
Fig. 11-19 AOQ Curves forSpire Records(Refer to Example 11.9)
Fig. 11-20 The House of Quality:The QFD Planning Matrix
