Question: Question 4 A process is in statistical control with x = 2 0 5 and ? b a r ( R ) = 1 5

Question 4
A process is in statistical control with x=205 and ?bar(R)=15. The control chart uses a sample size of n=6. Specifications are at 220+-10. The quality characteristic is normally distributed.
1- Estimate the potential capability of the process Cp.
2- Estimate the actual process capability.
3- Calculate P the percentage of the specification band used up by the process
4- Find a 95% confidence interval on Cp.
Question 4 A process is in statistical control with x=205 and

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