12th Edition

ISBN: 9781337630580

Author: Dale Ewen

Publisher: Cengage Learning

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Textbook Question

Chapter 15.10, Problem 1E

A certain manufacturing process has a target value of 1.20 cm and a standard deviation of 0.15 cm. A sample of nine measurements is made each hour.

a. Draw a mean control chart using data from Illustration 1.

b. Is the process out of control? If it is, at what time does the mean control chart signal lack of control?

Hour Mean	11.30	21.15	31.10	41.25	51.08	61.11
Hour Mean	71.18	81.15	91.0	101.12	111.08	121.16
Hour Mean	131.12	141.21	151.25	161.50	171.30	181.26
Hour Mean	191.29	201.19	211.26	221.31	231.17	241.15

ILLUSTRATION 1

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Chapter 15.9, Problem 17E

Chapter 15.10, Problem 2E

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Chapter 15 Solutions

Elementary Technical Mathematics

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Solution Summary: The author illustrates the upper control limit of the sample, which is .

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