Thirty successive heats of a steel alloy are tested at the Midwest Steel Works. The resulting data
Question:
a. Use appropriate control charts to determine if the alloy hardness is in a state of statistical control.
b. Use appropriate control charts to determine if the alloy hardness is in a state of statistical control.
c. By what percentage would the process variance need to be reduced to ensure that no more than 0.1% of the heats fail to comply with the minimum hardness requirement?
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Quality Inspired Management The Key to Sustainability
ISBN: 978-0131197565
1st edition
Authors: Harold Aikens
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