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ENGR 3680		Introduction to Quality Engineering
Case Study #1		Control Charts and Process Capability				Return to B.North on or before October 13th 2016
NAME (PRINTED):						Signature:
The specification range for these resistors is from 38 to 62 ohms, with a target of 50 ohms.
What is the Process Potential Cp based on these data?					Show how you calculated it!
What is the Process Performance Cpk based on these data?					Show how you calculated it!
As the Quality Engineer responsible for this line, would you recommend 100% testing? Explain your answer in less than 25 words.
Soon after setting up these control charts, you get a sequence of mean data thus:
Resistance (ohms)	53	47	49	52	55	56	58	59	60	58
Describe your approach, and explain your reason(s), after getting these data: Use less than 25 words.
Supporting Information
Constants for X bar and R chart
n (subgroup size)	A2	D3	D4	d2
2	1.880	0.000	3.268	1.128
3	1.023	0.000	2.574	1.693
4	0.729	0.000	2.282	2.059
5	0.577	0.000	2.114	2.326
6	0.483	0.000	2.004	2.534
7	0.419	0.076	1.924	2.704
8	0.373	0.136	1.864	2.847
9	0.337	0.184	1.816	2.970
10	0.308	0.223	1.777	3.078
Estimate of standard deviation s = Rbar/d2