Question

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-bar chart, using the given product parameters.
(b) Plot the data on the control chart.
(c) Is this process in control? Explain your reasoning.


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  • CreatedAugust 19, 2015
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