A bulb production line's voltages are monitored by control charts, with a Phase 1 control chart of
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Question:
A bulb production line's voltages are monitored by control charts, with a Phase 1 control chart of sum sigma xi = 361.5 & sum sigma Ri = 6.72, with n=4.
i) Bulbs with voltages less than LSL (lower specification limit) are scrapped & those with voltages above USL are reworked. If LSL= 11.8 & USL=12.2, how much is scrapped if the process small sigma (o) is cut by 25%?
ii) With unreduced variance, what's the PCR of the process?
Related Book For
Introduction to Statistical Quality Control
ISBN: 978-1118146811
7th edition
Authors: Douglas C Montgomery
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