As expected the process average appears to have dropped a little below target (it was a little

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As expected the process average appears to have dropped a little below target (it was a little above before the change) and the standard deviation has reduced. It appears that the improvements have succeeded in reducing process variability.

a. Construct X̅ and R charts to determine if the process is in a state of statistical control.

b. What is your estimate of the average tread wear and the standard deviation of tread wear for this product?

c. What is your estimate of the average tread wear and the standard deviation of tread wear for this product?

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Quality Inspired Management The Key to Sustainability

ISBN: 978-0131197565

1st edition

Authors: Harold Aikens

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Question Posted: Mar 11, 2016 02:47 AM

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As expected the process average appears to have dropped a little below target (it was a little

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a Range chart r 13 s 11 runs 11 CV 8 OK longest run 4 CV 8 OK chart r 13 s 11 runs 8 CV 8 not OK lon...View the full answer

Quality Inspired Management The Key to Sustainability

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