Consider the situation described in Exercise 6.80. A critical dimension (measured in ïm) is of interest to
Question:
(a) What can you say about overall process capability?
(b) Can you construct control charts that allow within-wafer variability to be evaluated?
To evaluate within-wafer variability, construct an R chart for each sample of 5 wafer positions (two wafers per lot number), for a total of 40 subgroups.
(c) What control charts would you establish to evaluate variability between wafers? Set up these charts and use them to draw conclusions about the process.
(d) What control charts would you use to evaluate lot-to-lot variability? Set up these charts and use them to draw conclusions about lot-to-lot variability.
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Related Book For
Introduction to Statistical Quality Control
ISBN: 978-1118146811
7th edition
Authors: Douglas C Montgomery
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