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.

Transcribed Image Text:

6,107 6,031 6,075 6,115 6,039 6,079 5,995 6,097614 6,039 6,154 6,054 6,028 6,002 6,062 6,094 6,05 6,031 5965 6,082