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Upper and Lower Control Limits for Testing

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The yield strength of a metal bolt has a mean of 6,050 pounds with a standard deviation of 100 pounds. Twenty samples of three bolts were tested, resulting in the means shown below.

(a) Construct upper and lower control limits for the¯ x chart, using the given product parameters.
(b) Plot the data on the control chart.
(c) Is this process in control? Explain your reasoning.

Bolts-M
6,107 6,031 6,075 6,115 6,039 6,079 5,995 6,097 6,114 6,039
6,154 6,054 6,028 6,002 6,062 6,094 6,051 6,031 5,965 6,082

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Solution Summary

The upper and lower control limits for testing are determined. A complete, neat and step-by-step solution is provided in the attached Excel file.

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