13 20 Selecting the best wafer-slicing machine. Silicon wafer slicing is a critical step in the production of semiconductor devices (e.g.. diodes, solar cells, transistors). Yuanpei (China) University researchers used control charts to aid in selecting the best silicon wafer-slicing machine (Computers & Industrial Engineering, Vol. 52, 2007). Samples of n = 2 wafers were sliced each hour for 67 consecutive hours and bow measurements (a measure of precision) were recorded. The resulting
- a. If the process is in control, what is the probability that a mean bow measurement for a randomly selected hour will fall above the upper control limit?
- b. If the process is in control, what is the probability that 3 of 67 mean bow measurements fall above the upper control limit?
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Statistics for Business and Economics (13th Edition)
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