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Homework answers / question archive / A manufacturing process involved in the production of plastic molds for a specific automotive application is under study

A manufacturing process involved in the production of plastic molds for a specific automotive application is under study

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A manufacturing process involved in the production of plastic molds for a specific automotive application is under study. To control the mean thickness of this (normally distributed) process with a standard deviation, s = 3.0, chart is used with n = 5, LCL = 14.15, and UCL = 15.85. If the process means shifts to 15.2, find the probability that the shift will be detected on the:

(a) first subsequent sample of 5 observations
(b) second subsequent sample of 5 observations

[3] Given the following information with regards to ( , S)-chart with n = 4:

-chart: UCL = 510, Center line = 500, and LCL = 490

S-chart: UCL = 12.9709, Center line = 6.5842, and LCL = 0.19753

(a) what fraction of items are nonconforming if specifications call for 501 ± 5?
(b) find the ARL if the process mean shifts to 493.

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