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.
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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