Answered: A quality inspector took five samples…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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Question

A quality inspector took five samples in five hours, each with four observations, of the length time for glue to dry. The analyst compute the mean of each sample and the computed the grand mean. All values are in minutes. Use this information to obtain three-sigma control limits for means. It is known from previous experience that the standard deviation of the process is 0.02 minutes.

Draw a control chart

Please provide a step-by-step solution

Observation/Sample
2
4
5
1
12.11
12.15
12.09
12.12
12.09
2
12.10
12.12
12.09
12.10
12.14
3
12.11
12.10
12.11
12.08
12.13
4
12.08
12.11
12.15
12.10
12.10
Average
12.10
12.12
12.11
12.10
12.12

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