Upper and lower control limits for testing

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Reference no: EM13110285

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

Reference no: EM13110285

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