Problem

The yield strength of a metal bolt has a mean of 6,050 pound, with a standard deviation of...

The yield strength of a metal bolt has a mean of 6,050 pound, with a standard deviation of l00 pounds. Twenty samples of three bolts were tested, resulting in the means shown below. (a) Construct upper and lower control limits for the chart, using the given product parameter. (b) Plot the data on the control chart. (c) Is this process in control? Explain your reasoning.

6,107	6,031	6,075	6,115	6,039	6,079	5,995	6,079	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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Solutions For Problems in Chapter 17

69CE
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