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Statistical Quality Control, 7th Edition
book

Statistical Quality Control, 7th Edition

by Douglas C. Montgomery
June 2012
Intermediate to advanced content levelIntermediate to advanced
768 pages
28h 23m
English
Wiley
Content preview from Statistical Quality Control, 7th Edition

Answers toSelected Exercises

CHAPTER 3

3.1.   (a) images = 16.029. (b) s = 0.0202.

3.5.   (a) images = 952.9. (b) s = 3.7.

3.7.   (a) images = 121.25. (b) s = 22.63.

3.15.   Both the normal and lognormal distributions appear to be reasonable models for the data.

3.17.   The lognormal distribution appears to be a reasonable model for the concentration data.

3.23.   (a) images = 89.476. (b) s = 4.158.

3.27.   sample space: {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} images

3.29.   (a) 0.0196. (b) 0.0198.

(c) Cutting occurrence rate reduces probability from 0.0198 to 0.0100.

3.31.   (a) k = 0.05. (b) µ = 1.867, σ2 = 0.615.

(c) F(x) = {0.383; x = 1   0.750; x = 2 1.000; x = 3

3.33.   (a) Approximately 11.8%. (b) Decrease profit by $5.90/calculator.

3.35.   Decision rule means 22% of samples will have one or more nonconforming units.

3.37.   0.921

3.43.   (a) 0.633. (b) 0.659. Approximation is not satisfactory.

(c) n/N = 0.033. Approximation is satisfactory.

(d) n = 11

3.45.   Pr{x = 0} = 0.364, Pr{x ≥ 2 } = 0.264

3.47.   Pr{

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